#### Answer

$6.4$

#### Work Step by Step

The number $6\frac{2}{5}$ really means $6+\frac{2}{5}$. We must convert $\frac{2}{5}$ to a decimal and then add it to 6.
To convert a fraction to a decimal, we divide the numerator by the denominator. Therefore, $\frac{2}{5}=2\div5=0.4$
We add $0.4$ to $6$ to get $6.4$