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13 Oct 2017, 00:14
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D
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Difficulty:
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Question Stats:
94% (01:15) correct
6%
(01:12)
wrong
based on 93
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If the average (arithmetic mean) of a, b, and 7 is 13, what is the average of a + 3, b – 5, and 6?
A. 7
B. 9
C. 10
D. 12
E. 16
A. 7
B. 9
C. 10
D. 12
E. 16
13 Oct 2017, 00:21
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If the average (arithmetic mean) of a, b, and 7 is 13, what is the average of a + 3, b – 5, and 6?
=> (a+b+7)/3 = 13 => a+b+7 = 39 => a+b = 32
Now avg of a+3,b-5, 6 => (a+3+b-5+6)/3 = (a+b+4)/3 = (32+4)/3 = 12
Answer: D
=> (a+b+7)/3 = 13 => a+b+7 = 39 => a+b = 32
Now avg of a+3,b-5, 6 => (a+3+b-5+6)/3 = (a+b+4)/3 = (32+4)/3 = 12
Answer: D
13 Oct 2017, 00:32
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A+B=(13*3)-7=32
Hence average will be
(32-5+3+6)/3=12
Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
Hence average will be
(32-5+3+6)/3=12
Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
