Which answer best explains how to solve this problem?

Mia said, “I’m thinking of a number. Divide this number by 2. Add 15 to the quotient. The answer is 24.” What is Mia’s number?


A.
Work backward
Start with 24.
Multiply by 2 and get 48.
Subtract 15 and get 33.
Mia started with the number 33.

B.
Work backward
Start with 24.
Subtract 15 and get 9.
Multiply by 2 and get 18.
Mia started with the number 18.

C.
Work backward
Start with 15.
Multiply by 2 and get 30.
Subtract 24 and get 6.
Mia started with the number 6.