Question

Average age of a family of 4 members was 19 years, 4 years back. Birth of a new child kept the average age of the family same even today. How old is the child today?



a.4 years



b.1 year



c.2 years



d.3 years

Answer 1

let a,b,c,d, are 4 members

d-new child

here a+b+c/3=19 .....eq.1

and also

a+b+c+d/4= 19 .......eq. 2

a+b+c =57.......3

a+b+c+d =76 ...........4

solve eq. 3 and 4

you will get the answer