Question

seven years ago Pinku was three years older than Tinku what is the difference in their age now​

Answer 1

Seven years ago pinku was three years Older Than tinku.

And hence there are 3 years differences in their ages.  

It is otherwise said that tinky is three years younger than pinku.

It is based on simple age based formula.

You can consider the page of pinku and tinku is x and y respectively.

Answer 2

let the age of pinku is x years.

age of Tinku is y years.

x-7 = y-7+3

x-y= -7+7+3

x-y = 3

hope it helps