One-fifth of a number is 9. Find the number.

The given question is based on fractions.

Answer: If one-fifth of a number is 9, then the number is 45.

Let us find the number.

Explanation:

Let the required number be "a".

1/5 of a = 9

1/5 × a = 9

a/5 = 9

a = 9 × 5 

a = 45

Thus, 45 is the required number.