Question

The rainfall total this year was 10.2 inches which is 20% less than last year's total rainfall. What was last years total rainfall?

Answer 1

The total of last year's rainfall was 12.75 inches.

Explanation:

The total rainfall this year is 10.2 inches.

Let the total rainfall last year be x inches.

It is given that the total rain this year 20% less than last year's total rainfall.

Therefore total rainfall last year is 12.75 inches.

Answer 2

The total rainfall last year is 12.75 inches.

Explanation:

The total rainfall this year is 10.2 inches.

Let the total rainfall last year be x inches.

It is given that the total rain this year 20% less than last year's total rainfall.

`x-(20)/(100)x=10.2`

`(100x-20x)/(100)=10.2`

`(80x)/(100)=10.2`

`(8x)/(10)=10.2`

`8x=102`

`x=12.75`

Therefore total rainfall last year is 12.75 inches.