GRE Sample Test 2 Quantitative Reasoning 1

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14 - 16
Questions 14 through 16 refer to the following graphs.
WORLD ELECTRICITY PRODUCTION BY CONTINENT IN YEAR x
(1 megawatt-hour = 1,000,000 watt-hours)

Electricity Production in Megawatt - hours
DISTRIBUTION OF WORLD POPULATION BY CONTINENT IN YEAR x

Question : 16 of 20

Marks: +1, -0

In Year x, if South America had a population of approximately 368 million, what was the approximate population, in millions, of Africa?

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Solution:

Africa’s population is 10.6 percent on the pie chart; South America’s is 7.9 percent.
Right away, you can eliminate all of the answer choices that are smaller than 368. Now you are left with (A) and (B). Because the question gives you South America’s population (368 million), you can use a proportion to find the population of Africa. The proportion would look like this:

{0.079}/{368}

{0.106}/{x}

, where x is equal to the population of Africa. Cross multiplying gives you 0.079x = 0.106 × 368, so x = 493.7.

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