Question

this is another from a different section can you show me how to solve it.

An electronics company produces three
models of stereo speakers, models A, B, and C, and can
deliver them by truck, van, or station wagon. A truck holds
2 boxes of model A, 2 of model B, and 3 of model C. A van
holds 3 boxes of model A, 4 boxes of model B, and 2 boxes
of model C. A station wagon holds 3 boxes of model A,
5 boxes of model B, and 1 box of model C.
a. If 25 boxes of model A, 33 boxes of model B, and
22 boxes of model C are to be delivered, how many vehicles
of each type should be used so that all operate at full
capacity?
b. Model C has been discontinued. If 25 boxes of model A
and 33 boxes of model B are to be delivered, how many
vehicles of each type should be used so that all operate at
full capacity?