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?

A). 1 year

B). 1.5 years

C). 2 years

D). 2.5 years

3 years ago

Total age of 6 members $ \large = 19 \times 6 = 114$

Now total age of these 6 members would be $ \large = 114 + (3 \times 6) = 132$

As a baby is born, let its age is $x$

Now average of 7 members would be $\large (132 + x ) / 7 = 19$

$ \large x = (19 \times 7 ) - 132$

$ \large x = 1 $

1 year

6 * 22 = 132

7 * 19 = 133

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