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The average of the first 5 numbers in a set consisting of 12 numbers i
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15 Oct 2024, 00:17
15 Oct 2024, 00:17
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100% (01:14) wrong based on 8 sessions
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The average of the first 5 numbers in a set consisting of 12 numbers is 6, while the average of all the numbers in the set is 7.5. Approximately what is the average of the last 7 numbers?
A. 8.47
B. 8.57
C. 8.67
D. 8.77
E. None of these
A. 8.47
B. 8.57
C. 8.67
D. 8.77
E. None of these
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Re: The average of the first 5 numbers in a set consisting of 12 numbers i
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09 Nov 2024, 12:00
09 Nov 2024, 12:00
1
Why the answer is not B?
M1:
Different to the average of 5 numbers: \(7.5-6=1.5\)
Value of 7 remaining numbers = \(7.5+(\frac{1.5*5}{7})=8.571\)
M2:
\(\frac{7.5*12-6*5}{7}=8.571\)
Posted from my mobile device
M1:
Different to the average of 5 numbers: \(7.5-6=1.5\)
Value of 7 remaining numbers = \(7.5+(\frac{1.5*5}{7})=8.571\)
M2:
\(\frac{7.5*12-6*5}{7}=8.571\)
Posted from my mobile device
gmatclubot
Re: The average of the first 5 numbers in a set consisting of 12 numbers i [#permalink]
09 Nov 2024, 12:00
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