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World Electricity Production

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World Electricity Production [#permalink] New post 03 Jun 2017, 09:09
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In Year x, on which continent did electricity production most closely equal electricity production in Europe?

A) Africa
B) Asia
C) Australia
D) South America
E) North America

[Reveal] Spoiler: OA
B


In Year x, for which continent was the ratio of electricity production to percent of population the greatest?

A) Africa
B) Asia
C) South America
D) Europe
E) North America

[Reveal] Spoiler: OA
E


In Year x, if South America had a population of approximately 368 million, what was the approximate population, in millions, of Africa?
A) 494
B) 470
C) 274
D) 150
E) 39

[Reveal] Spoiler: OA
A


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Re: World Electricity Production [#permalink] New post 26 Sep 2017, 07:51
Q1: Easily solved by using the first chart. The continent having the black line more similar to that of Europe is Asia. Answer B.

Q2: Trickier. Let's assume world population is 100 so that we can read the pie chart easily. Then, each percentage is actually equal to the number of inhabitants. Then, we need to estimate from the first chart the amount of electricity and divide it for the population from the pie chart. The highest ratio is the one of North America (Australia is not among the answers). Answer E.

Q3: If South America has a population of 368 mln, then the total population is 368/0.079 = 4658.23. Then, the population of Africa is 4658.23*0.106=493.77 that is rounded to 494 mln. Answer A!
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World Electricity Production

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