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The average age of 8 children of a family is 12 yr. If the age of 7 children are 12, 8, 14, 11, 9, 13 and 15 yr. then the age of 8th child will be?

12 yr
14 yr
13 yr
15 yr

Correct Answer: 14 yr

Explanation:

∵ Total age of 8 children = 8 x 12 = 96 yr
And total age of 7 children = 12 + 8 + 14 + 11 + 9 + 13 + 15 = 82
∴ The age of 8th child = 96 - 82 = 14 yr

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