Question

The sum of two rational numbers is −3. If one of them is $\frac{-15}{7}$, find the other.

Answer 1

$\begin{array}{l}\\ \text{Let the other number be}\mathit{\text{x.}}\\ \frac{-15}{7}+x=-3\\ =>x=-3-\frac{(-15)}{7}\\ \\ \begin{array}{l}=>x=\frac{-21+15}{7}\\ =>x=\frac{-6}{7}\\ \text{Hence, the required number is}\frac{-6}{7}\end{array}\\ \end{array}$