Question

What should be added to $-\frac{17}{15}$ to get $-\frac{8}{21}$

Answer 1

Let the number be $x$.

$\Rightarrow -\frac{17}{15}+x=-\frac{8}{21}$

$\Rightarrow x=\frac{17}{15}-\frac{8}{21}$

$\Rightarrow x=\frac{79}{105}$

Therefore $\frac{79}{105}$ is to be added to $-\frac{17}{15}$ to get $-\frac{8}{21}$