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#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # The average (arithmetic mean) of a and b is 10, and the ave  Question banks Downloads My Bookmarks Reviews Important topics
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The average (arithmetic mean) of a and b is 10, and the ave [#permalink]
Expert's post 00:00

Question Stats: 90% (00:42) correct 10% (01:09) wrong based on 10 sessions

The average (arithmetic mean) of a and b is 10, and the average of c and d is 7. If the average of a, b, and c is 8, what is the value of d ?

[Reveal] Spoiler: OA
10

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Re: The average (arithmetic mean) of a and b is 10, and the ave [#permalink]
From the info above, it is easy to see that a+b = 2*10 = 20, while a+b+c = 3*8 = 24. Thus, c = (a+b+c)-(a+b) = 4.

Then, c+d = 2*7 = 14 and c = 4 so that d = 14-4 = 10. Re: The average (arithmetic mean) of a and b is 10, and the ave   [#permalink] 11 Oct 2017, 06:15
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