To find out how many acres of each type of wheat the farmer planted, we can divide the total area planted by the number of types of wheat.
The total area planted is \( \frac{2}{5} \) acres. Since she planted an equal amount of two types of wheat, we divide this area by 2:
\[ \text{Area of each type} = \frac{2}{5} \div 2 \]
Dividing by 2 is the same as multiplying by \( \frac{1}{2} \):
\[ \text{Area of each type} = \frac{2}{5} \times \frac{1}{2} = \frac{2 \times 1}{5 \times 2} = \frac{2}{10} = \frac{1}{5} \]
Therefore, the farmer planted \( \frac{1}{5} \) acres of each type of wheat.