106. The average age of a family of 6 members in 22 years. If the age of the youngest member be 7 years, then what was the average age of the family at the birth of the youngest member? a) 10 years b) 12 years c) 15 years d) 18 years
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The average age is 22 years for 6 members. Total age = Average age × Number of members = 22 × 6 = 132 years. Show more…
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