GRE Math : How to find the whole from the part
Study concepts, example questions & explanations for GRE Math
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Example Questions
Example Question #21 : Percentage
36 is what percent of 145
40.3%
403%
24.8%
36%
2.48%
24.8%
divide: 36/145 = 0.248; multiply by 100 to get percent
24.8%
Example Question #2 : How To Find The Whole From The Part
36 is x% of 133. What is x
42
19
22.4
27
10
27
36 is x% of 133
that means that 36 = (x%)(133)
x% = 36/133 X 100 = 27%
Example Question #3 : Whole And Part
Max walks 1 mile in 15 minutes. Belinda takes only 12 minutes to walk 1 mile. If Max and Belinda leave their homes at the same time, how far has Belinda walked when Max has walked 1 mile?
5/4 mile
1 mile
3/4 mile
3/2 mile
4/3 mile
5/4 mile
Belinda walks faster than Max, so she should walk over a mile in the same time that Max walks 1 mile. We can eliminate the answer choices that aren't over a mile. It takes Max 3 minutes longer to walk a mile, so Belinda will walk for 3 more minutes after she finishes her first mile. If she walks 1 mile in 12 minutes, she walks 1/12 miles in 1 minute, or 3/12 = 1/4 mile in 3 minutes. So she walks 1 1/4 miles, or 5/4 miles.
Example Question #1 : Whole And Part
If 
Let's first pick numbers. If y = 25, x = 100. It's tempting to pick 25% as the answer, but x is greater than y, so the percentage must be greater than 100%. x is four times y, or 400% of y.
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