Sample GMAT Practice Question Medium / Hard Difficulty from 800score

If 10 gallons of grape juice are added to 40 gallons of a mixture, which has 10 percent grape juice, then what percent of the resulting mixture is grape juice?

a) 14%
b) 25%
c) 28%
d) 30%
e) 50%

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 10 gallons of grape juice, we will end up with 14 gallons of grape juice and 36 gallons of other components and we will have a total of 50 gallons of the mixture.

So 14/50 of the new mixture is grape juice. Now we convert this to a percent:

Percent Grape Juice = 14/50 = 28/100 = 28%.

The correct answer is choice (C)

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