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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
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QOTD# 17 approximate ratio of energy used from [#permalink]
Expert's post 00:00

Question Stats: 28% (00:00) correct 71% (02:54) wrong based on 7 sessions Question 9. What is the approximate ratio of energy used from oil in 1979 to energy used from oil in 2004 ?
A. $$\frac{55}{1}$$
B. $$\frac{35}{1}$$
C. $$\frac{11}{7}$$
D. $$\frac{25}{18}$$
E. $$\frac{9}{10}$$

[Reveal] Spoiler: OA
D

Question 10 Which of the following can be inferred from the graphs?
Indicate all possible values.
A. The number of power plants constructed in the U.S. between 1979 and 2004.
B. The percent of total energy used from oil, coal, and natural gas sources was greater in 2004 than the percent of total energy used from the same sources in 1979.
C. The amount of energy used from hydroelectric sources in 2004 was less than one fourth the amount of energy used from hydroelectric sources in 1979.
[Reveal] Spoiler: OA
B,C

Drill 2
Question: 9, 10
Page: 464

[Reveal] Spoiler: Img
Attachment: di new.jpg [ 26.22 KiB | Viewed 3377 times ]

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GRE Prep Club Legend  Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156 WE: Business Development (Energy and Utilities)
Followers: 111

Kudos [?]: 1854 , given: 397

Re: QOTD# 17 approximate ratio of energy used from [#permalink]
Expert's post
Explanation

9. For 1979, find 27.5% of 18,509, which is approximately 5,090. For 2004, find 17.5% of 20,623, which is approximately 3,609. Round the numbers and reduce the ratio: $$\frac{5000}{3600}=\frac{25}{18}$$, choice D.

10. Options B and C are correct.
Choice (A) is incorrect; the graph gives no information on the number of power plants constructed.

Choice (B) is correct. In 1979, coal and oil were each 26% and natural gas was 34% of total energy used, for a total of 68%. In 2004, coal was 34%, natural gas was 33%, and oil was 18% of total energy used, for a total of 85%.

For choice (C), the amount of energy used from hydroelectric sources in 1979 is approximately 925 units and the amount for 2004 is approximately 203 units. You calculate these figures by using the different totals for each year and the percentage of total energy represented on the graph by hydroelectric energy. 203 is less than one fourth of 925, and thus choice (C) is valid.
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Manager Joined: 27 Sep 2017
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Re: QOTD# 17 approximate ratio of energy used from [#permalink]
sandy wrote:
Explanation

9. For 1979, find 27.5% of 18,509, which is approximately 5,090. For 2004, find 17.5% of 20,623, which is approximately 3,609. Round the numbers and reduce the ratio: $$\frac{5000}{3600}=\frac{25}{18}$$, choice D.

10. Options B and C are correct.
Choice (A) is incorrect; the graph gives no information on the number of power plants constructed.

Choice (B) is correct. In 1979, coal and oil were each 26% and natural gas was 34% of total energy used, for a total of 68%. In 2004, coal was 34%, natural gas was 33%, and oil was 18% of total energy used, for a total of 85%.

For choice (C), the amount of energy used from hydroelectric sources in 1979 is approximately 925 units and the amount for 2004 is approximately 203 units. You calculate these figures by using the different totals for each year and the percentage of total energy represented on the graph by hydroelectric energy. 203 is less than one fourth of 925, and thus choice (C) is valid.

the first question, for 2004, find 17.5% of 5090 NOT 20,623 since the total of 2004 is 5090. Manager Joined: 27 Sep 2017
Posts: 112
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Kudos [?]: 30  , given: 4

Re: QOTD# 17 approximate ratio of energy used from [#permalink]
1
This post received
KUDOS
sandy wrote:
Explanation

9. For 1979, find 27.5% of 18,509, which is approximately 5,090. For 2004, find 17.5% of 20,623, which is approximately 3,609. Round the numbers and reduce the ratio: $$\frac{5000}{3600}=\frac{25}{18}$$, choice D.

10. Options B and C are correct.
Choice (A) is incorrect; the graph gives no information on the number of power plants constructed.

Choice (B) is correct. In 1979, coal and oil were each 26% and natural gas was 34% of total energy used, for a total of 68%. In 2004, coal was 34%, natural gas was 33%, and oil was 18% of total energy used, for a total of 85%.

For choice (C), the amount of energy used from hydroelectric sources in 1979 is approximately 925 units and the amount for 2004 is approximately 203 units. You calculate these figures by using the different totals for each year and the percentage of total energy represented on the graph by hydroelectric energy. 203 is less than one fourth of 925, and thus choice (C) is valid.

Choice (B) incorrect since In 1979, coal and oil were each 26% and natural gas was 34% of total energy used, for a total of """86%"""". In 2004, coal was 34%, natural gas was 33%, and oil was 18% of total energy used, for a total of 85%.
Manager Joined: 27 Feb 2017
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Re: QOTD# 17 approximate ratio of energy used from [#permalink]
Can someone explain Q.1? The value I am getting is nowhere near the given options. I also do not understand how did you get 17.5% of 20,623 for 2004. Is the information misprinted or something?
Intern Joined: 01 Dec 2018
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Re: QOTD# 17 approximate ratio of energy used from [#permalink]
the option B of Q2 is ambiguous because the you cannot look for the accurate percent in that graph. while the the two variables are just 1 % more or less than the other. Thus, it's tricky if you are not careful. I did not choose B because my estimation was 1979 : 88% and 2004: 87%. CRY
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