three years back three members family average age 17 years after that one member will join the family the average became the same age?
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the sum of their age was 5 multiplied by 17 = 85 yrs . a baby was born [ meaning that there are now 6 family members was re told the present age of the family is . since the current sum of the 6 family is 102 , the age of baby is 102- 100 = 2 years
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