Question

father's is three times sons age and the sum of their ages is 100. Find sons age

Answer 1

let the age of father and son be x and y
x=3y
x+y=100
3y+y=100
4y=100
y=25years =sons age
x=3*25=75years=fathers age

Answer 2

Let the age of son be x,

Then Fathers age will be 3x,

Sum of their ages = 100

x + 3x = 100

4x = 100

x= 100/4

x = 25

Hence, Son's age is 25 years.