Question

If 20% of a number is 56 and 45% of the same number is 126, find 25% of that
number.

Answer 1

70

Explanation:

1) "20% of a number is 56"

Lets call this number "x".

0.20x = 56 (percents can become decimals by dividing 100)

2) 45% of the same number is 126

This will be the same number "x".

0.45x = 126

3) Divide by 0.45 (you can use a calculator)

0.45x / .45 = 126 / .45

x = 280

4) "25% of that number"

that number is x

25% is one-fourth of a number so

0.25x = 280/4

0.25x = 70