5th - 8th grade

Bill has 7 students in his basketball team. Only 5 can play at once. How many different groups of 5 students can have on the court at a time?

Hint: it's easier to think of the reverse of this questions - how many different groups of 2 students can sit on the bench.

3rd grade

3 gum balls cost a 25 cents. How much does it cost to buy 12 gum balls?