Math Is Fun Forum

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,277

Re: Oral puzzles

Hi anonimnystefy and bobbym,

The solution #1167 is perfect. Well done!

#1168. The average of a non-zero number and its square is 5 times the number. Find the number.

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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: Oral puzzles

Hi ganesh;

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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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

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Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,277

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1168 is correct. Well done!

#1169. The average of 7 consecutive numbers is 20. Find the largest of these numbers.

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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: Oral puzzles

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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

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anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: Oral puzzles

hi ganesh

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“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: 46,277

Re: Oral puzzles

Hi bobbym, Denominator, and anonimnystefy,

The solution #1169 is correct. Well done!

#1170. If log[sub]x[/sub]y = 100 and log[sub]2[/sub]x = 10, then what is the value of y?

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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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

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bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Oral puzzles

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: 46,277

Re: Oral puzzles

Hi Denominator and bobbym,

The

.

Well done, bobbym! Good attempt, Denominator!

#1171. A and B undertake to do a peice of work for $600. A alone can do it in 6 days while B alone can do it in 8 days. With the help of C, they finish it in 3 days. Find the share of each.

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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: Oral puzzles

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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

Sorry, I had to do this on paper (I hope you don't mind)
I'm new to these kinds of questions
Using what bobby told me...

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Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,277

Re: Oral puzzles

Hi bobbyn and Denominator,

The solution #1171 is perfect. Neat job!

#1172. If

, x and y being positive whole numbers, then find the values of x and y respectively.

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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: Oral puzzles

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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

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Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,277

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1172 is perfect. Good work!

#1173. If the wages of 6 men for 15 days be $2100, then find the wages of 9 men for 12 days.

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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: Oral puzzles

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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

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Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 46,277

Re: Oral puzzles

Hi bobbym and Denominator,

The solution #1173 is correct. Well done!

#1174. In measuring the sides of a rectangle, one side is taken 5% in excess, and the other 4% in deficit. Find the error percent in the area calculated from these measurements.

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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.

Denominator

Member

Registered: 2009-11-23

Posts: 219

Re: Oral puzzles

I'm not so confident with my answer...

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bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Oral puzzles

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: 46,277

Re: Oral puzzles

Hi Denominator and bobbym,

The solution #1174 is perfect. Neat job!

#1175. If each side of a square is increased by 25%, find the percentage change in its area.

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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: Oral puzzles

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: 46,277

Re: Oral puzzles

Hi bobbym,

The solution #1175 is correct. Well done! [The exact percentage increase is 56.25%].

#1176. Find the length of the altitude of an equilateral triangle of side

cm.

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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.