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What is the average of x, y, z, and t if x + y + z = 18 y + z + t =
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26 Nov 2021, 05:57
26 Nov 2021, 05:57
Expert Reply
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Question Stats:
80% (01:16) correct
20% (02:08) wrong based on 5 sessions
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This question is part of the GRE - Skill Builder Project for a Q170
What is the average of x, y, z, and t if x + y + z = 18, y + z + t = 15, x + t = 7
Show: ::
5
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Re: What is the average of x, y, z, and t if x + y + z = 18 y + z + t =
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26 Nov 2021, 06:11
26 Nov 2021, 06:11
1
Carcass wrote:
This question is part of the GRE - Skill Builder Project for a Q170
What is the average of x, y, z, and t if x + y + z = 18, y + z + t = 15, x + t = 7
Show: ::
5
Given:
x + y + z = 18
y + z + t = 15
x + t = 7
Add the three equations to get: 2x + 2y + 2z + 2t = 40
Divide both sides by 2 to get: x + y + z + t = 20
So the average of the four numbers = (x + y + z + t)/4 = 20/4 = 5
Answer: 5
gmatclubot
Re: What is the average of x, y, z, and t if x + y + z = 18 y + z + t = [#permalink]
26 Nov 2021, 06:11
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