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
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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