Question

The sum of two rational numbers is $\frac{4}{21}$. If one of them is $\frac{5}{7}$, find the other.

Answer 1

For given the sum of two rational number is $\frac{4}{21}$

Where one of the rational number is $\frac{5}{7}$

Hence the other rational number is $=\frac{4}{21}-\frac{5}{7}=\frac{4-15}{21}=-\frac{11}{21}$