How would you go about setting up the following word problem?

If you add one third of a number to the number itself, you get 48. What is the number?

It's done like the last problem you did where n + 2/5 n = 56. If you understood how the other one was done (as you said you did) then you should have no problem doing this one. If you can't get started, explain what you don't understand.