The total weight of a box containing 50 packets of biscuits each weighing 120 g
= 50 × 120 g = 6000 g
The capacity of a van = 900 kg = 900 × 1000 g = 900000 g
∴ The required number of boxes = 900000 + 6000 = 150
Therefore, 150 boxes can be loaded in the van.