SOLUTION: A man buys 12 lts of liquid which contains 20% of the SUBSTANCE and the rest is water. He then mixes it with 10 lts of another mixture with 30% of SUBSTANCE.What is the % of wate

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Question 851244: A man buys 12 lts of liquid which contains 20% of the SUBSTANCE and the rest is water. He then mixes it with
10 lts of another mixture with 30% of SUBSTANCE.What is the % of water in the new mixture?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
I changed one of the words. It is already understood that both starting solutions are "liquids" of a substance dissolved in water.

highlight%28%2812%2A20%2B10%2A30%29%2F%2812%2B10%29=percentSubstance%29, just a direct computation.
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%28240%2B300%29%2F22
540%2F22
270%2F11
highlight%2824.5%29 percent SUBSTANCE------------computed as 24%266%2F11, 24.5454545454....