Question

What number should be added to −1 so as to get $\frac{5}{7}$?

Answer 1

Let the required number be x.

Now,

$-1+x=\frac{5}{7}$
$\Rightarrow -1+x+1=\frac{5}{7}+1$ (Adding 1 to both the sides)

$$\begin{gathered} \Rightarrow x=\left({\displaystyle \frac{5+7}{7}}\right) \\ \Rightarrow x=\frac{12}{7} \end{gathered}$$
Hence, the required number is $\frac{12}{7}$.