Question

Determine how much water needs to be evaporated from 15 kilograms of a 6% salt solution to produce an 8% salt solution.

Answer 1

-0.64=-0.06x divide both sides by -0.06
x=10.66667 oz---------------amount of pure water that must evaporate
CK
0.04(32)=0.06(21.33333)
1.28~1.28
Hope this helps

Answer 2

1.2kg
15kg of 6%salt solution/100 for 1 percent
*8 to get the final answer 
hope it helps
:)