Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**NullRoot****Member**- Registered: 2007-11-19
- Posts: 162

If you have two numbers, A and B, then the percentage of B that is represented by A is: (A/B)*100

If the price of 12 pencils is x, and 1x is the profit he makes from 8x, then the percentage percentage profit is:

(1x/8x)*100

By rules of multiplication, 1x/8x = (1/8)*(x/x) = (1/8)*(1) = 1/8

So, his percentage profit is: (1/8)*100 = (0.125)*100 = 12.5%

Trillian: Five to one against and falling. Four to one against and falling Three to one, two, one. Probability factor of one to one. We have normality. I repeat, we have normality. Anything you still cant cope with is therefore your own problem.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

#426.The factorial of a number is always less than

. True or false?#427. If the sum of internal angles of a polygon is 720° , what is the name of the polygon?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

Correct, JohnnyReinB,

[color=ff0099]**Well done!**[/color]

#428. If x+y=7 and xy=12, what is the value of x² +y² ?

#429. If x^(1/3)+y^(1/3)+z^(1/3)=0, then x+y+z=3xyz, True or False?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

Have we Plutoins no hope?

*Last edited by JohnnyReinB (2007-12-07 15:03:31)*

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**pi man****Member**- Registered: 2006-07-06
- Posts: 251

Quote from JohnnyReinB: "What happens if you raise a number to a fraction?"

x ^ (1/2) is the square root of X

x ^ (1/3) is the cube root of X

.

.

.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

#430. What is the side total of a magic square containing numbers from 1 to 49?

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

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

Offline

**TheDude****Member**- Registered: 2007-10-23
- Posts: 361

Wrap it in bacon

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

**Well done, TheDude, All answers correct!!!**

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

#431. If x=y=2z and xyz=256 then what is the value of x?

#432. Pipe A can fill in 20 minutes and Pipe B in 30 mins and Pipe C can empty the same in 40 mins.If all of them work together, find the time taken to fill the tank.

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

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

**Excellent, JohnnyReinB!!! All correct!!!**

#433. Solve for x.

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

Offline

**NullRoot****Member**- Registered: 2007-11-19
- Posts: 162

Trillian: Five to one against and falling. Four to one against and falling Three to one, two, one. Probability factor of one to one. We have normality. I repeat, we have normality. Anything you still cant cope with is therefore your own problem.

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

Solution to #433.**Well done, NullRoot! You are correct!!!**

#434. What is (a-x)(b-x)(c-x).......(z-x)?

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

#435. Solve

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

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

what do you mean by solving it?

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

Solve for x, that is get x in terms of a and b.

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

Offline

**JohnnyReinB****Member**- Registered: 2007-10-08
- Posts: 453

ok.

*"There is not a difference between an in-law and an outlaw, except maybe that an outlaw is wanted" *

Nisi Quam Primum, Nequequam

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

No, you are not correct!

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

Offline

**TheDude****Member**- Registered: 2007-10-23
- Posts: 361

Wrap it in bacon

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

**Excellent, TheDude!!!Keep it up!!!**

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

436. If the operation,^ is defined by the equation x ^ y = 2x + y, what is the value of a in

2 ^ a = a ^ 3?

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

437. A right circular cylinder and a sphere have the same volume and same radius. What is the ratio of their curved surfaces?

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

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 20,125

438. What is the value of

(a) log 5

(b) -log 2

(c) 2 log 3

(d) 2 log 2

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

Offline

**NullRoot****Member**- Registered: 2007-11-19
- Posts: 162

Trillian: Five to one against and falling. Four to one against and falling Three to one, two, one. Probability factor of one to one. We have normality. I repeat, we have normality. Anything you still cant cope with is therefore your own problem.

Offline