The average weight of each box in a consignment of 20 boxes of mangoes and 15 boxes of apples is 30 kg. If the average weight of a box of mangoes is 35 kg, then what is the average weight of a box of apples?

A

$$\frac{70}{3}kg$$

B

$$\frac{75}{2}kg$$

C

$$\frac{70}{5}kg$$

D

$$\frac{26}{5}kg$$