Camiya had a summer lemonade stand where she sold small cups of lemonade for $1.50 and large cups for $2.25. If she sold a total of 200 cups of lemonade for $315, how many LARGE cups did she sell?

Answer 1

L = large cups, S = small cups

L + S = 200

2.25L + 1.5S = 315

Multiply the 2nd equation by (4/3): 3L + 2S = 420

Multiply the 1st equation by 2: 2L + 2S = 400

Subtract: L = 20

and S = 180