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Quantitative Aptitude

Averages

The average o...

Question

The average of 7 numbers is 5. If the average of fist six of these numbers is 4, the seventh number is:

A

14

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B

12

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C

11

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D

15

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E

None of these

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Solution

The correct option is C 11
Sum of seven members = $7 \times 5 = 35$
Sum of first six numbers $= 6 \times 4 = 24$
Therefore, the seventh number $= 35 - 24 = 11$ .

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