Hint:
Large Packet = 36 biscuits
2 Large Packets = 3 Medium packets
2 x 36 = 3 Medium Packets
72 biscuits = 3 medium packets
72/3 biscuits = 1 medium packet
24 biscuits = 1 medium packet
2 medium packet = 3 small packet
2 x 24 = 3 small packet
48 = 3 small packet
48/3 biscuit = 1 small packet
16 biscuit = 1 small packet
