16 three years ago the average age of a family of six members was 19 years. A boy have been born, the average age of the family is the same today. What is the age of the boy?
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3years back total age of 6members family = 19 x 6 = 114
total present age of 6 family memebers = 114 + 6*3 = 114 + 18 = 132
Total present age of 6family memeber + boy = 19 x 7 = 133
the age of child = 133 - 132 = 1 year old
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