chiccufrazer1 wrote:

A 7.5 liter mixture of water and sugar is 60% sugar. If 1.5 liters of water is added, approximately what is the % of the new mixture of sugar?

A. 40%

B. 50%

C. 63%

D. 64%

E. 68

ASIDE: We can eliminate C, D and E immediately (without performing any calculations).

Here's why: If we begin with a mixture that's 60% sugar and then we

dilute it by adding water, the resulting mixture will have

less than 60% sugar. So, eliminate C, D and E.

Okay, on to the solution.

7.5 liter mixture of water and sugar is 60% sugar.60% of 7.5 liters is sugar

60% of 7.5 = 4.5, so the 4.5 mixture has 4.5 liters of sugar

1.5 liters of water is addedSo, the volume of the new mixture is 9 liters.

Since no sugar was added, the volume of the sugar is still 4.5 liters

(4.5)/9 = 1/2 = 50%

So, the new mixture is [spoiler]50% sugar[/spoiler].

Answer:

BCheers,

Brent

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Brent Hanneson – GMATPrepNow.com

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