How many liters of water must be evaporated from 50 liters of a 2 percent sugar solution to get a 4 percent sugar solution?  Pick one:
A) 20
B) 25
C) 30
D) 35
E) 40
Let x be the amount that needs to be evaporated.   0.02(50) = 0.04(50-x)   0.04x = 2 - 1= 
<gadget id="calculator">2 - 1</gadget>
<output>1</output>
1/0.04= 
<gadget id="calculator">1/0.04</gadget>
<output>25</output>
25 liters   The answer is 25.
<result>B</result>
How many liters of water must be evaporated from 50 liters of a 2 percent sugar solution to get a 4 percent sugar solution?