Question 964372
Let the child's age be x.
Then the father's age is 3x.
Then the grandfather's age is (50+x).
The sum of their ages is 110.
x+3x+50+x=110
5x+50=110
5x=60
x=12.
The child's age is 12.
The father's age is 36.
The grandfather's age is 62.