Question

Find the unknown using an inverse operation:
$s-\frac{2}{5}=\frac{3}{5}$

Answer 1

$s-\frac{2}{5}=\frac{3}{5}$

$5s-2=3$

$5s=5$

Multiplying the above eqn by the inverse of $5$, we get

$5\times \frac{1}{5}s=5\times \frac{1}{5}$

$s=1$