Question

128 is what percent of 640

Answer 1

↑ 128 is 20% of 640
Lets solve:
640 IS 100% Because its the output value of the task
So lets look for x
We got 100%=640
and x%=128
Now im going to write this out as
100% / x%=640/128
Now we just have to solve this simple equation. 
(100/x)*x=(640/128)*x
-Multiply both sides of the equation by x
Now we divide both sides of the equation by 5 to get x.
100=5x
100/5=x
20=x
and
x=20
So we got our answer of 20%

Answer 2

Answer:

The answer is A)64.

Step-by-step explanation:

640 divided by 10= 64, so 10% of 640 is 64.

Hope this helps!!