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In Year x, on which continent did electricity production mos

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Carcass
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In Year x, on which continent did electricity production mos [#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

Show: :: 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

Show: :: 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

Show: :: OA
A

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IlCreatore
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Re: World Electricity Production [#permalink] New post   26 Sep 2017, 07:51
1
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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almondspeeing
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Re: In Year x, on which continent did electricity production mos [#permalink] New post   04 Aug 2019, 08:48
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Hi, thanks for this question.

I am unable to get the third one. If I make SA population as 8% (round of 7.9%). Total population is 46 x10^8.
Ten person of this for Africa, answer comes to be ~460 million. For that reason I picked B.

any guidance on why not to pick 8%?

Thanks.
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Re: In Year x, on which continent did electricity production mos [#permalink] New post   04 Aug 2019, 10:01
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The solution provided is perfect
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!

SA had 7.9 % of the entire number, which is X

So, 7.9 %

368=0.079 x

x= 368/0.079 = 4658.23

Now, Africa is 4658.23*0.106=493.77

Hope now is more clear.
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BrDickinson
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Re: In Year x, on which continent did electricity production mos [#permalink] New post   10 Aug 2022, 14:59
Carcass wrote:
The solution provided is perfect
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!

SA had 7.9 % of the entire number, which is X

So, 7.9 %

368=0.079 x

x= 368/0.079 = 4658.23

Now, Africa is 4658.23*0.106=493.77

Hope now is more clear.



But this is the type of question ETS would never write. If we use .08 and 0.1 instead of .079 and 0.106, we get very close to option 470. So, the practice material ends up inducing us to eschew estimation altogether... in the test, estimation plays a big role on time management... Anyway...
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