What percent of water must be evaporated from a 4% salt solution so that it becomes 6% salt solution? Round your answer to the nearest hundredth.
what is the amount of water
Do you mean How much water must be evaporated from 32 ounces of 4% salt solution to make a 6% salt solution?
If you mean QM's question then the answer would be 10 2/3
to the nearest hundredth then it would be 10.67
Pick an easy number ...10 ml of solution to start
salt in starting solution = salt in final solution
.04 (10) = .06 ( 10-x) x is the amount to remove from the 10 ml
.4 = .6 - .06x
-.2 = - .06x
x = 3.33 remove 3.333 ml from every 10 ml starting amount 3.3333/10 = 33 1/3 %