The present ages of three persons in proportions 4 : 7 : 9. Eight years ago, the sum fo their ages was 56. Find their present ages (in years).

Ayesha's father was $38$ years of age when she was born while her mother was $36$ years old when her brother four years younger to her was born. What is the difference between the ages of her parents?

A person's present age is two-fifth of the age of his mother. After $8$ years, he will be one-half of the age of his mother. How old is the mother at present?

1. The difference of age b/w $R$ and $Q=$ The difference of age b/w $Q$ and $T$.

2. Sum of age of $R$ and $T$ is $50$ i.e. $\left(R+T\right)=50$.