Jane buys 4 packets of biscuits and each packet contains 4 biscuits. How many biscuits does Jane have in total?
Three brands A, B and C of biscuits are available in packets of 12, 15, and 21 biscuits respectively. If a shopkeeper wants to buy an equal number of biscuits of each brand, then what is the minimum number of packets of each brand he should buy? [4 MARKS]