Percentages and Given Numbers

Question

If 40% of a given number is 8, then what is 15% of the given number?

Answer 1

Let n = the number

 

40% of n equals 8 means that 0.40n = 8

n = 8/0.40 = 20

 

15% of n is 0.15n

0.15n = 0.15(20) = 3

 

The answer is 3.