The table below illustrates that, in one day, john can produce either 12 cars or mow 3 wheels while mark can produce either 6 cars or mow 6 wheels

.Suppose in total, between the two of them, they need to mow exactly 5 wheels in one day. To maximize their overall (i.e. joint) production, who should make the wheels, or how many wheels should they each make? Explain