3 वर्ष पहले 5 सदस्यों वाले परिवार की औसत आयु 17 वर्ष थी। एक बच्चे का जन्म हुआ तथा परिवार की वर्तमान औसत आयु समान है। बच्चे की वर्तमान आयु ज्ञात करे?

Options

A. 1 years
B. `1(1)/(2) years `
C. 2 years
D. 3 years

Answer

C

Explanation

According to the question
Average age of a family of 5 members 3 year ago = 17 years
sum of ages of a family members = 5 x 17 =85 years
A baby having been born the average age of the family is same today.
`therefore` Sum of age of a family of 6 members =17 x 6 =102 years
`therefore` Sum of age of a family of 5 members at present =85+5 x 3=85+15=100 years
`therefore` Age of child =102 -100=2 years