Question

What number should be added to 77 to make the sum 0?
 77 –77 0 –76

Answer 1

Answer: -77

Explanation:

Let the unknown number be x.

We have been asked to find the unknown x.

It is given that when the unknown x is added to 77, the sum will be zero. Thus the mathematical representation will be:

`77+x=0`

Taking the unknown to one side of the equation ad solving:

`x=0-77`

`x=-77`

Thus the required number is -77.