SOLUTION: A 90kg solution has 10% salt. How much water must be evaporated to leave 20% salt?

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Question 796647: A 90kg solution has 10% salt. How much water must be evaporated to leave 20% salt?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Evaporate w kilograms of water.

highlight%2890%2A10%2F%2890-w%29=20%29
20%2890-w%29=9%2A100
2%2890-w%29=90
180-2w=90
180-90=2w
.
highlight%28w=45%29 kilograms