Which describes the calculations that could be used to solve this problem?

lauren has 42 muffins to pack into boxes and bags. she has one box that will hold 12 muffins. she will put the rest of the muffins into bags. she wants to put 3 muffins into each bag.

how many bags of muffins will lauren be able to make?

a.
subtract 42 – 12.
then multiply the difference by 3.

b.
add 3 + 12.
then add 42 to the sum.

c.
add 42 + 12.
then divide the sum by 3.

d.
subtract 42 – 12.
then divide the difference by 3.