Question

The sum of 5 children born at 3 year intervals each is 50. What is the age of the oldest?

Answer 1

let the smallest one be x

3+x,6+x,9+x,12+x

sum=50

a/q

x+3+x+6+x+9+x+12+x= 50

3+6+9+12+x+x+x+x+x=50

30+5x=50

5x=50-30

5x=20

x=20/5

x=4

age of the oldest one is=4+12=16yrs