Explanation

Given:

The total of their current ages is 80 years.

Three years ago, each of them was 3 years younger, so:

Amar's age three years ago = Amar's current age - 3

Akbar's age three years ago = Akbar's current age - 3

Ali's age three years ago = Ali's current age - 3

The total of their ages three years ago would be:

(Amar ′ s current age−3)+(Akbar ′ s current age−3)+(Ali ′ current age−3)

This simplifies to:

(Amar  ′ s current age+Akbar′ s current age+Ali' s current age)−9

Since the total of their current ages is 80 years:

80−9=71

Therefore, the total of their ages three years ago was 71 years