How many liters of water must be evaporated from 50 liters of a 4 percent sugar solution to get a 10 percent sugar solution? Choose the correct answer:
A) 15  B) 20  C) 25  D) 28  E) 30
Let x be the amount that needs to be evaporated.   0.04(50) = 0.1(50-x)   0.1x = 5 - 2= 
<gadget id="calculator">5 - 2</gadget>
<output>3</output>
3/0.1= 
<gadget id="calculator">3/0.1</gadget>
<output>30</output>
30 liters   The answer is 30.
<result>E</result>
How many liters of water must be evaporated from 50 liters of a 4 percent sugar solution to get a 10 percent sugar solution?