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Re: Energy use by year [#permalink]
Rajneesh Garg wrote:
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%



How did you calculated the personal use? :o :?
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Re: Energy use by year [#permalink]
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To solve this question you have to take into account first of all the first graph

Attachment:
#GREpracticequestion In 1995, how many of the categories shown had energy use greater than 150 million kilowatt-hours.jpg
#GREpracticequestion In 1995, how many of the categories shown had energy use greater than 150 million kilowatt-hours.jpg [ 28.65 KiB | Viewed 7589 times ]


So 600 million

Then the second graph in which you do have the categories

Attachment:
#GREpracticequestion If the population of Country Y increased by 20 percent from 1990 to 1995.jpg
#GREpracticequestion If the population of Country Y increased by 20 percent from 1990 to 1995.jpg [ 25.28 KiB | Viewed 7566 times ]


In 1995 two categories have 30% of 600 and two 20%.

30% of 600 = 180 which is > 150

So industrial and and gov is the answer C
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Re: Energy use by year [#permalink]
Just had a doubt in the third question. In the first option do we have to compare use of farm energy between 1990 and 2010 only or do we consider years between them also like 1995. Also, why is the third option wrong?
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Re: Energy use by year [#permalink]
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Re: Energy use by year [#permalink]
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