Phil bought two hamburgers and a milk shake for 1030 Janice

Phil bought two hamburgers and a milk shake for $10.30. Janice bought three hamburgers and a milk shake for $14.80. What is the cost of the two milk shakes?

A. $1.30

B. $1.45

C. $2.60

D. $4.50

Solution

C. You need to find either the cost of one burger or the cost of one milk shake. It is possible to find the cost of one burger by subtracting Phil’s cost from Janice’s cost because the only difference is the cost of one burger. So $14.80 minus $10.30 = $4.50. Therefore, the cost of one burger is $4.50. If Phil’s two burgers = $9.00, then one milk shake = $10.30 —$9.00 = $1.30. The problem asks for the cost of two milkshakes, which would be 2($1.30) or $2.60. Therefore the correct answer is $2.60.