Can't figure out this problem

Sorry that I wasn't more specific in the title, but I don't really know what to call this problem...

"In a two-digit number, the ten's digit is 3 more than the one's digit. If the digits are reversed, the difference between the two numbers is 27. Find the two-digit number."

a. 52

b. 63

c. 73

d. 85

I'm really confused, because unless there's something I'm missing here, 52, 63, and 85 would all work. Problem is, this isn't **supposed** to be a question with more than one answer, so I'm very lost.

I'd appreciate it if someone could help me figure this out.