Question

The Stingrays at the zoo requires the 196 gallon tank to be 4% salt. After a period of time, some water evaporated, raising the salinity to 7%.

How many gallons of water must be resupplied in order to bring the salinity back down to 4%?

Answer 1

196 x 3 / 100 = 5,88

Explanation:

7% - 4% = 3%

So we need to had 3% t have again 4%