How many gallons of pure water should be evaporated from 160 gallons of a solution containing 12% salt so that the remaining solution contains 20% salt? what are you being asked to find in this problem? gallons of pure water gallons of 12% salt solution gallons of 20% salt solution

The correct answer option is: 'gallons of pure water'.

Step-by-step explanation:

We are asked to find the number of gallons of pure water in this problem.

We know that the amount of salt that exists in the solution before the pure water is evaporated (0.12)(160) has to be equal to the amount of salt which is there after the evaporation takes place (0.20)(160-x).

Therefore, the number of gallons of pure water can be found using this equation:

(0.12) (160) = (0.20) (160-x)