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# What is the average (arithmetic mean) of R, S, and T?

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Math Expert
Joined: 02 Sep 2009
Posts: 58417
What is the average (arithmetic mean) of R, S, and T?  [#permalink]

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02 Apr 2018, 21:49
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Difficulty:

45% (medium)

Question Stats:

64% (01:29) correct 36% (01:54) wrong based on 54 sessions

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What is the average (arithmetic mean) of R, S, and T?

(1) R + 2S + 3T = 30
(2) 3R = 90 - (2S + T)

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Intern
Joined: 28 Apr 2014
Posts: 49
GMAT 1: 640 Q50 V25
Re: What is the average (arithmetic mean) of R, S, and T?  [#permalink]

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02 Apr 2018, 22:01
C

Add both the eon 4(R+S+T)=120
therefore avg=10
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Joined: 05 Feb 2016
Posts: 168
Location: India
Concentration: General Management, Marketing
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Re: What is the average (arithmetic mean) of R, S, and T?  [#permalink]

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02 Apr 2018, 22:58
Bunuel wrote:
What is the average (arithmetic mean) of R, S, and T?

(1) R + 2S + 3T = 30
(2) 3R = 90 - (2S + T)

From 1:insufficient
From 2:insufficient
combining both :
4(R+S+T)=120
therefore avg=10
Re: What is the average (arithmetic mean) of R, S, and T?   [#permalink] 02 Apr 2018, 22:58
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# What is the average (arithmetic mean) of R, S, and T?

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