Question

A charity bingo game costs $2 per round and has a $13 entry fee for an adult. It costs $3 per round and a $10 entry fee for a child. For how many rounds of bingo are the costs the same for an adult and a child?
2
3
4
5

Answer 1

Let r = number of rounds. Adult cost = 13 + 2r. Child cost = 10 + 3r.
Set equal: 13 + 2r = 10 + 3r → 3 = r.
So 3 rounds.