The present ages of Jeevan and Manish are 58 years and 20 years, respectively. Find the sum of their ages 4 years ago.

Let's calculate the ages of both individuals 4 years ago:
* Jeevan's age 4 years ago = $58-4=54\text{ years}$
* Manish's age 4 years ago = $20-4=16\text{ years}$

Sum of their ages 4 years ago:

$$\text{Sum}=54+16=70\text{ years}$$

Alternatively:

$$\text{Sum of present ages}=58+20=78\text{ years}$$

$$\text{Sum 4 years ago}=78-(2\times 4)=78-8=70\text{ years}$$