How to solve a multi-step problem?

Question

How do you solve multi-step problems with numbers, like: there are 65 students going on a field trip. there are t-shirts, and all students get 6 t-shirts each. each t-shirt cost 10 dollars. if the total number of money raised up is 480 dollars, how much is left over.

Answer 1

There are 65 students, each gets 6 shirts to sell. The shirts cost $10 each. If they raised $480, how many shirts are left over?

Total number of shirts = 65(6) = 390

Total number of shirts sold = 480/10 = 48

Number of shirts unsold = 390 - 48 = 342

There were 342 shirts left over.