<PRE><B>Question 982448</B>
how much water is to be evaporated from 20 liters of 20 percent sugar solution to get 30 percent sugar solution.
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Equation:
water - water = water
0.80*20 - 1*x = 0.70(20-x)
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Multiply thru by 100 to get:
80*20 - 100x = 70*20 - 70x
30x = 10*20
x = (1/3)20 = 6 2/3 Liters (amt. of water to evaporate)
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Cheers,
Stan H.
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