23. There are two telephone companies provide home phone service in New York City. Company A charges $25 monthly fee and $0.10 for one minute after 30 minutes phone call. Company B charges $20 monthly fee and $0.12 for one minute after 30 minutes phone call. By what minutes, these two companies will charge the same?

Question

23. There are two telephone companies provide home phone service in New York City. Company A charges $25 monthly fee and $0.10 for one minute after 30 minutes phone call. Company B charges $20 monthly fee and $0.12 for one minute after 30 minutes phone call. By what minutes, these two companies will charge the same?
I have:
A:25.00+0.10(m-30)
B:20.00+0.12(m-30)

Stephen · Answer

For m minutes,
A: 25.00+0.10(m-30)
B: 20.00+0.12(m-30)

So, just solve for m when A=B

Kind of strange wording for a math problem in school. The only way it would make since is if it were 2 part question to the solve for x minutes.