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?

$\frac{70}{3}$ kg

Let average weight of a box of apple = A kg

According to question ,

20 × 35 + 15 × A = ( 20+15) × 30

700 + 15A = 1050

15A = 350

A = \(\frac{70}{3}\)

So , average weight of a box of apple = \(\frac{70}{3}\) kg