pranab01 wrote:

A full glass of juice is a mixture of 20% grape juice and 80% apple juice. The contents of the glass are poured into a pitcher that is 200 percent larger than the glass. The remainder of the pitcher is filled with 16 ounces of water. What was the original volume of grape juice in the mixture?

(A) 1.6 ounce

(B) 3.2 ounce

(C) 4.8 ounce

(D) 6.4 ounce

(E) 8 ounces

The contents of the glass are poured into a pitcher that is 200 percent larger than the glass. The remainder of the pitcher is filled with 16 ounces of water.Many students read "200 percent larger" and mistakenly conclude that the pitcher's volume is TWICE the glass's volume.

This is not true.

EXAMPLE: If the glass holds

5 liters of water, then 200% of 5 =

10So, 200% LARGER =

5 +

10 = 15 liters.

In other words, 15 liters is 200% MORE than 5 liters.

Likewise, if the glass holds

8 liters of water, then 200% of 8 =

16So, 200% LARGER =

8 +

16 = 24 liters.

In other words, 24 liters is 200% MORE than 8 liters.

Notice, that in the last example, we can see that, if we start with

8 liters and add

16 liters, the resulting volume is 200% more than the starting volume.

This is EXACTLY what's happening in the question.

So, we can conclude that the glass must contain

8 liters of juice.

A full glass of juice is a mixture of 20% grape juice and 80% apple juice.If the

8 liters of juice is 20% grape juice, then...

Volume of grape juice = 20% of

8= 1.6 liters

Answer: A

Cheers,

Brent

_________________

Brent Hanneson – Creator of greenlighttestprep.com

If you enjoy my solutions, you'll like my GRE prep course.

Sign up for GRE Question of the Day emails