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Geoff used $630 to buy a new guitar. This amount was 15 perc  Question banks Downloads My Bookmarks Reviews Important topics Author Message TAGS: Moderator Joined: 18 Apr 2015 Posts: 5862 Followers: 94 Kudos [?]: 1151 [3] , given: 5465 Geoff used$630 to buy a new guitar. This amount was 15 perc [#permalink]  27 Jan 2016, 16:21
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Question Stats:

62% (00:37) correct 37% (00:55) wrong based on 37 sessions
Geoff used $630 to buy a new guitar. This amount was 15 percent of his earnings last summer.  Quantity A Quantity B The amount of Geoff’searnings last summer notused to buy the new guitar$3,570

A)The quantity in Column A is greater.
B)The quantity in Column B is greater.
C)The two quantities are equal.
D)The relationship cannot be determined from the information given.

Practice Questions
Question: 7
Page: 466
Difficulty: easy/medium
[Reveal] Spoiler: OA

_________________
Moderator
Joined: 18 Apr 2015
Posts: 5862
Followers: 94

Kudos [?]: 1151 [0], given: 5465

Re: Geoff used $630 to buy a new guitar. This amount was 15 perc [#permalink] 27 Jan 2016, 16:26 Expert's post Solution Be careful to read such question. You could stumble in the last step and pick A as the best answer. $$650=0.15 of X$$ So Geoff earnings is in total $$4200$$. But the latter minus the$ needed to buy a guitar we end up with $$3570$$

The correct answer is $$C$$
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GRE Instructor
Joined: 10 Apr 2015
Posts: 1539
Followers: 56

Kudos [?]: 1464 [0], given: 8

Re: Geoff used $630 to buy a new guitar. This amount was 15 perc [#permalink] 03 Nov 2017, 08:29 Expert's post Carcass wrote: Geoff used$630 to buy a new guitar. This amount was 15 percent of his earnings last summer.

 Quantity A Quantity B The amount of Geoff’searnings last summer notused to buy the new guitar $3,570 Geoff used$630 to buy a new guitar. This amount was 15 percent of his earnings last summer
Let E = Geoff's earnings last summer
So, $630 = 15% of E In other words,$630 = 0.15E
So solve for E, we divide both sides by 0.15
When we do so, we get: E = $4200 If$4200 equals Geoff's earnings last summer, and Geoff spent $630 on the guitar, then the amount of earnings NOT used to buy the new guitar =$4200 - $630 =$3570

We get:
Quantity A: $3570 Quantity B:$3,570

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com