Question

42% of what number is 0.21 ?

Answer 1

The answer is 0.5.

Explanation:

As 42 divided by 2 equals 21, and we have 0.21 which equals 21 hundredths, we divide by 2 to get 0.5, because 1 divided by 2=0.5.

Answer 2

42% of x= 0.21
0.42x=0.21
x=
`(0.21)/(0.42)`
x=0.5