Answer:
a = Negative one-fifth
Step-by-step explanation:
The given equation is :
[tex]\dfrac{2}{5}+a=\dfrac{1}{5}[/tex]
We need to find the value of a.
Subtract 2/5 from both sides.
[tex]\dfrac{2}{5}+a-\dfrac{2}{5}=\dfrac{1}{5}-\dfrac{2}{5}\\\\a=\frac{1}{5}-\frac{2}{5}\\\\a=\dfrac{-1}{5}[/tex]
So, the correct answer is Negative one-fifth. Hence, the correct option is (b).