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The average (arithmetic mean) of a and b is 10, and the ave

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The average (arithmetic mean) of a and b is 10, and the ave [#permalink] New post 05 Jun 2017, 08:48
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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 ?

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[Reveal] Spoiler: OA
10

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Re: The average (arithmetic mean) of a and b is 10, and the ave [#permalink] New post 11 Oct 2017, 06:15
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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The average (arithmetic mean) of a and b is 10, and the ave

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