How many liters of water must be evaporated from 50 liters of a 6-percent sugar solution to get a 10-percent solution?  Choices.
A) 20	B) 22	C) 24	D) 26	E) 28
6% of a 50 liter solution is 3L which is 10% of the solution at the end.   The solution at the end must be 30 L.   We need to evaporate 20 liters.   The answer is 20.
<result>A</result>
How many liters of water must be evaporated from 50 liters of a 6-percent sugar solution to get a 10-percent solution?