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What should be added to $\frac{2}{5}$ to get $-1$?
Given :
The given number is $\frac{2}{5}$.
To do :
We have to find the number that should be added to $\frac{2}{5}$ to get $-1$.
Solution :
Let the number to be added to $\frac{2}{5}$ to get $-1$ be x.
Therefore,
$\frac{2}{5} + x = -1$
$x = -1 -\frac{2}{5}$
$x = \frac{(-1\times 5-2)}{5}$
$x = \frac{(-5-2)}{5}$
$x = \frac{-7}{5}$.
The number to be added is $\frac{-7}{5}$.
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