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On the most recent test in stats class, Jamal scored x point

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GMAT Club Legend
GMAT Club Legend
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Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

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On the most recent test in stats class, Jamal scored x point [#permalink] New post 09 Dec 2017, 18:41
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Question Stats:

100% (00:34) correct 0% (00:00) wrong based on 2 sessions
On the most recent test in stats class, Jamal scored x points and Raya scored 73 points. If the average of Cliff and Raya’s scores is 79 points, and the average of Jamal and Cliff’s scores is 89, then x =

Drill 2
Question: 12
Page: 530


[Reveal] Spoiler: OA
93

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Sandy
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GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

CAT Tests
Re: On the most recent test in stats class, Jamal scored x point [#permalink] New post 29 Dec 2017, 15:32
Expert's post
Explanation

Use the Average Pie. Consider Cliff and Raya’s average first: There are 2 of them, and their average is 79, so multiply 2 × 79 to get their total of 158. Call Cliff’s score c, and c + 73 = 158, so c = 85.

Now repeat the process with Jamal and Cliff’s average: 2 people with an average of 89, so 2 × 89 = 178 total points. Therefore, x + 85 = 178, and x is 93.
_________________

Sandy
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Re: On the most recent test in stats class, Jamal scored x point   [#permalink] 29 Dec 2017, 15:32
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On the most recent test in stats class, Jamal scored x point

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