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.
If we have a 4% salt solution , then it must contain 96% water
And a 6% salt solution must contain 94% water
So
[ 96 - 94 ] / 96 x 100% =
2 / 96 x 100% =
1/48 x 100% =
.0208 x 100% ≈
2.08 %