For Monday morning's staff meeting, Jim bought 2 bags of bagels and 3 packages of cream cheese and paid $13.25 (excluding sales tax).

For Monday morning's staff meeting, Jim bought 2 bags of bagels and 3 packages of cream cheese and paid $13.25 (excluding sales tax). For Friday's meeting, he bought 5 bags of bagels and 2 packages of cream cheese and paid $20.75 (again, excluding sales tax). How much do bags of bagels and packages of cream cheese cost? Please help me understand the equation you used.