The sum of a number and its successor is $ 79 . $ Find the successor of the number.

Given :

The sum of a number and its successor is 79.

To find :

We have to find the successor of the number.

Solution :

Let the number be x.

This implies, the successor of the number = $x+1.$

Therefore,

$x+(x+1)=79$

$2x+1=79$

$2x=79-1$

$2x=78$

$x=\frac{78}{2}$

$x=39$

The value of the number is 39.

The successor of the number is $39+1=40.$