How many liters of water must be evaporated from 50 liters of a 8-percent sugar solution to get a 10-percent solution? Select:
A) 8  B) 10  C) 12  D) 14  E) 16
8% of a 50 liter solution is 4L which is 10% of the solution at the end.   The solution at the end must be 40 L.   We need to evaporate 10 liters.   The answer is 10.
<result>B</result>
How many liters of water must be evaporated from 50 liters of a 8-percent sugar solution to get a 10-percent solution?