Question

7. This year, the water in a reservoir dropped by 60%. For the original water level to be restored next year, by what percent must the remaining reserves increase?

Answer 1

Given: Water in a reservoir dropped by 60%

Explanation:

let the total water level of reservoir be 100.

then, in first year

the water reservoir dropped = 60% of 100

=
`(60)/(100)` * 100

= 60

therefore, total water level needed to be restored till next year= 100

remaining water level to restore till next year= 100-60

=40

percentage=
`(40)/(100)` * 100

=40%