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Energy use by year

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Energy use by year [#permalink]  08 Oct 2017, 01:28
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#GREpracticequestion In 1995, how many of the categories shown had energy use greater than 150 million kilowatt-hours.jpg [ 41.68 KiB | Viewed 413 times ]
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#GREpracticequestion If the population of Country Y increased by 20 percent from 1990 to 1995.jpg [ 35.81 KiB | Viewed 413 times ]
1) In 1995, how many of the categories shown had energy use greater than 150 million kilowatt-hours?

A. None
B. One
C. Two
D. Three
E. Four

[Reveal] Spoiler: OA
C

2) If the population of Country Y increased by 20 percent from 1990 to 1995, approximately what was the percent decrease in the per capita personal use of energy between those two years?

A. 0%
B. 17%
C. 25%
D. 35%
E. 50%

[Reveal] Spoiler: OA
D

3) Which of the following can be inferred from the graphs?

Choose $$all$$ that apply.

❑ Farm use of energy increased between 1990 and 2010.

❑ In 2010, industrial use of energy was greater than industrial use of energy in 1995.

❑ The percentage of energy use by government in 2010 was at least three times the percentage of energy use by government in 1990.

❑ More kilowatt-hours of energy were used for farm purposes in 2005 than in 2000.

❑ The energy usage by type was most equally distributed over the four categories in 1990.

[Reveal] Spoiler: OA
A,D

[Reveal] Spoiler: OA

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Re: Energy use by year [#permalink]  13 Oct 2017, 20:47
answer 1 - Industrial and government

2 category
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Re: Energy use by year [#permalink]  13 Oct 2017, 20:55
let the population in 1990 = 100, 1995 = 1.2*100 = 120

personal use 1990 = 160, Per capita use = 1.6
Personal use 1995 = 120, Per capita use = 1

change = (1.6-1)/1.6 = .37 ~ 37%
Re: Energy use by year   [#permalink] 13 Oct 2017, 20:55
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