if each of four numbers is trippled, their average is multiplied by
a) 12
b) 3
c) 4
d) 9
e) 81

Question

if each of four numbers is trippled, their average is multiplied by
a) 12
b) 3
c) 4 
d) 9
e) 81

kinggeorge · Answer

Take an example. Suppose all four numbers were 1. Then the average would be 1. If they were all tripled, then they would all be 3, and the average would be 3 as well.

kinggeorge · Answer

So you also have to triple the average.

anonymous · Answer

well how do i calucate is :
3 * 3 * 3 = 27
4 * 4 * 4 = 64
9 * 9 * 9 = 729
all final values are divisbile by 3 
does it make sense ... to solve it like this

kinggeorge · Answer

If you would like an algebraic explanation, suppose $a, b, c, d$ are your 4 numbers. Then the average is $${a+b+c+d \over 4}$$Now we triple the numbers and find the average again.$${3a+3b+3c+3d \over 4} ={3(a+b+c+d) \over 4}=3\cdot{a+b+c+d \over 4}$$

anonymous · Answer

Excellent ... Thanks got it...

kinggeorge · Answer

You're welcome.

anonymous · Answer

How can I post another question ?

kinggeorge · Answer

Click the button that says "Close," and you'll be able to type another one.