Question

age of father is twice the sum of ages of his two children. 20 years later, his age will be equal to the sum of ages of his children. Find the age of the father

Answer 1

let the age of sons be x.
then, fathers age =2x
After 20 years
sons' age = x + 20
fathers age = 2x+ 20
According to the question,
sons age = father's age
x + 20=2x+20
transpse the same variables
20- 20=2x-x
0 = x