Need with part b

craig is creating gift baskets for the food pantry to give away. he has 91 canned food items and 52 boxed food items, giving him a total of 143 items. the sum is shown below.

he wants to make sure that every gift basket has an equal amount of canned food items and an equal number of boxed food items, as well as use all of the food items.

part a: determine how many gift baskets he will be able to make. (already done)

part b: then, rewrite the sum to show how these food items will be distributed among the gift baskets. (don't understand)

part c: explain why craig could not make any more gift baskets in this way with the available food items. (already done)