Which equations would help us find out how many mornings Imran practiced playing his trumpet

Imran practiced playing his trumpet for 10 minutes each morning until he had practiced for a total of 50 minutes.
Which equations would help us find out how many mornings Imran practiced playing his trumpet?
Choose 2 answers:
A. 10 ÷ ?= 5
B. 10 X 5=?
C.10 x ?=50
D. 50 ÷ 10=?