the cost of a lunch of 3 sandwiches, 7 cups of coffee, and 1 donut is $3.15. The cost of a lunch of 4 sandwiches, 10 cups of coffee, and 1 donut was $4.20 at the same cafe. How much will 1 sandwich, 1 cup of coffee, and 1 donut cost?
2007-09-30 08:56:41 · 3 answers · asked by 1234 1 in Science & Mathematics ➔ Mathematics
Sorry, you can't solve three variables with only two equations.
Notice that cost in equation one is 3/4 of equation two.
If the coffee and donuts are free, the sandwiches cost $1.05 each. That's one solution. There are any number of solutions to this problem.
2007-09-30 09:15:07 · answer #1 · answered by Steve A 7 · 0⤊ 1⤋
Sandwich = $0.45
Coffee = $0.20
Donut = $0.40
The meal will be $1.05
2007-09-30 09:06:42 · answer #2 · answered by Anonymous · 0⤊ 1⤋
I'm positive there isn't enough info to get all three item's prices.
Donut = 1.05 though.
2007-09-30 09:03:46 · answer #3 · answered by SRT8Challenger 1 · 0⤊ 3⤋