Which number sentences show ways to solve the problem?

the 9 members of a conservation club purchased a total of 45 tree saplings. each member bought the same number of trees to plant in the community. each tree cost $15. how much did each member pay for the trees?

choose all answers that are correct.

a.
15 × 9 = 135 and 135 – 75 = 60

b.
3 × 15 = 45 and 45 + 15 = 60

c.
45 ÷ 9 = 5 and 5 × 15 = 75

d.
45 × 15 = 675 and 675 ÷ 9 = 75

must choose more than one answer