If 20 gallons of grape juice are added to 40 gallons of a mixture, which contains 10 percent grape juice then what percent of the resulting mixture is grape juice?	Choose the correct choice from the following:	A) 14%	B) 25%	C) 28%	D) 34%	E) 40%
OFFICIAL SOLUTION:   If we start with 40 gallons of a mixture that is 10% grape juice, then we have:   40 × 0.10 = 4 gallons of grape juice.   40 × 0.90 = 36 gallons of other components.   If we add 20 gallons of grape juice, we will end up with 24 gallons of grape juice and 36 gallons of other components, and we will have a total of 60 gallons of the mixture.   So 24/60 of the new mixture is grape juice. Now we convert this to a percent:Percent Grape Juice = 40/100 =40%.   The correct answer is choice (40%)
<result>E</result>
If 20 gallons of grape juice are added to 40 gallons of a mixture, which contains 10 percent grape juice then what percent of the resulting mixture is grape juice?