Math Is Fun Forum

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solutions #4147 and #4148 are correct. Brilliant!

#4149. When an article is sold at $340, there is a loss of 15%. Find the Cost Price.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solution #4149 is correct. Well done!

#4150. A train at the speed of 72 kilometers per hour crosses another train moving in the same direction at the speed of 54 kilometers per hour in 1 minute. Determine the length of both the trains if they are equal.

#4151. A train 200 meters long crosses another train traveling in opposite direction in 1 seconds. If the length of the other train is 250 meters and the speed of both the trains are equal, what are the speeds in kilometers per hour?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

Your solution also seems correct; good work!

#4152. Two trains 100 meters and 120 meters long respectively traveling in opposite directions cross each other in 4 seconds. If the speed of one train is 90 kilometers per hour, what is the speed of the other train (in kilometers per hour)?

#4153. A train crosses platform in 60 seconds, traveling at the speed of 54 kilometers per hour. If the length of the platform is 500 meters, what is the length of the train?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solutions #4152 and #4153 are correct. Excellent!

#4154. A train 100 meters long crosses another train of equal length traveling in opposite direction in 5 seconds. What is the speed of either of the train if they are given to be equal?

#4155. A train crosses a platform in 60 seconds traveling at the speed of 45 kilometers per hour. If the length of the platform is 100 meters, what would be the time required by the train to cross a pole?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: 10 second questions

Hi ganesh

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi anonimnystefy,

The solutions #4154 and #4155 are perfect. Splendid!

#4156. Multiply

by

.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solution #4156 is correct. Fantastic!

#4157. A sells a Personal Computer to B for $4860 thereby losing 19%. B sells it to C at a price which would have given A 17% profit. Find B's gain.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

#4158. A train aving to perform a journey of 150 miles is directed after 100 miles to reduce its speed by one-fifth. The train reached the destination half-an-hour late. What is its ordinary rate?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solution #4158 is correct. Excellent!

#4159. The sum of the ages of 2 brothers is 50. Ten years ago, the elder has twice the age of the younger. What is the present age of the elder?

#4160. Ramya's age was thrice Sita's age 5 years ago. If the difference of their ages is now 16 years. Find the present age of Sita.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: 10 second questions

Hi ganesh

Last edited by anonimnystefy (2012-06-27 01:22:33)

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym and anonimnystefy,

The solutions #4149 and #4160 are perfect. Good work!

#4161. The average age of a class of 22 students is 21 years. The average increases by 1 when the teacher's age also included. What is the age of the teacher?

#4162. Mother's age today is thrice as her daughter's age. After 10 years, it would be double. How old is the daughter today?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solutions #4161 and #4162 are correct. Good work!

#4163. A train takes 9 seconds to pass completely through a station 70 meters long and 5 seconds through another station 50 meters long. Find the length of the train.

#4164. If a train 100 meters long passes a telegraph pole in 2 seconds then what is the time taken by it to cross a railway platform 150 meters long?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solution #4164 is perfect. Good work!

#4165. A train 100 meters long is traveling at a speed of 77 kilometers per hour. What is the time in which it would pass a passerby by walking 5 kilometers per hour in the same direction?

#4166. A train 120 meters long moving at a speed of 30 meters per second overtakes a man moving at 10 meters per second in opposite direction. In how much time would the train pass by the man?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,182

Re: 10 second questions

Hi bobbym,

The solution #4165 is correct. Neat job!

#4167. A train 75 meters long passes a man, running at 2 kilometers per hour in the same direction in which the train is going in 15 seconds. What is the speed of the train in kilometers per hour?

#4168. A train 120 meters long passed a man running at 6 kilometers per hour in the same direction opposite to tat of the train in 5 seconds. What is the speed of the train in kilometers per hour?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.