Mrs. Lee baked 225 brownies for a bake sell. She sold 135 brownies ,and put the rest in plastic containers for her friends. Each container had 6 brownies. Which equation can be use to find b ,the number of containers she used.

A. b=(225+135) x 6

B. b(225+135) -6

C. b(225+135) +6

D. b(225+135) divided by 6