Taylor Swift bought 3 Cokes for $5. Kelly Clarkson bought 2 Cokes and a hamburger for $9.

Answer 1

3C = 5

one coke costs C=5/3 about $1.67

2C +H = 9

H = 9-2C = 9-10/3 = 27/3 -10/3 = 17/3 = about $5.67 for one hamburger