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Math Expert
Joined: 02 Sep 2009
Posts: 47077

If the average (arithmetic mean) of p and r is n and the average [#permalink]
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28 Dec 2017, 00:21
Question Stats:
83% (00:36) correct 17% (00:55) wrong based on 30 sessions
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Manager
Joined: 09 Aug 2017
Posts: 123

Re: If the average (arithmetic mean) of p and r is n and the average [#permalink]
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28 Dec 2017, 00:50
p+r = 2n s+r = 6n So, sp=4n Answer is "A".



Intern
Joined: 28 Dec 2017
Posts: 31

Re: If the average (arithmetic mean) of p and r is n and the average [#permalink]
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29 Dec 2017, 10:48
(p + r)/2 = n, hence p + r = 2n (equation 1) (r + s)/2 = 3n, hence r + s = 6n (equation 2)
Subtract equation 2 from equation 1, and s  p = 4n (answer A)




Re: If the average (arithmetic mean) of p and r is n and the average
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29 Dec 2017, 10:48






