three years ago the average age of a family 5 members..., Average, General Mathematics

Question:Three years ago, the average age of a family of `5` members was `17` years .A baby having been born ,the average age of the family is the same today. The present age of the baby is :

A `2 yrs` 
B `2.4 yrs` 
C `3 yrs` 
D `1.5 yrs`

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+ AnswerA

+ ExplanationTotal age of `5` members, `3` years ago

`= (17 xx 5)`

Total age of `5`members now

`= (85 + 3 xx 5)`

`= 100 years`

Total age of members now

`= (17 xx 6)`

`= 102 years`

Age of the baby

`= 2 years`

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