Given the number of students who eat in the cafeteria,
Maria knows that she must purchase enough potatoes and
green beans to prepare a minimum of 10 kilograms (kg) of
casserole each week. (There are 1,000 g in 1 kg.) Again for
simplicity in planning, she assumes that only the potatoes
and green beans determine the amount of casserole that can
be prepared. Maria does not establish an upper limit on the
amount of casserole to prepare, since she knows all leftovers
can be served for many days thereafter or can be used creatively
in preparing other dishes.