Question

Alica bought two burgers and three small fries at Dave's Burger shack for a total of $ 21.18. Jack bought four burgers and two small fries for a total of $29.56. How much does each item cost individually ?

Answer 1

• Burger $5.79, fries $3.2

Explanation:

Let burger = b and fries = f

Alica:

• 2b + 3f = 21.18

Jack:

• 4b + 2f = 29.56

Simplify the second equation and subtract from the first one:

• 2b + f = 14.78
• 2b + 3f - 2b - f = 21.18 - 14.78
• 2f = 6.4
• f = 3.2

Find the value of b:

• 2b + 3.2 = 14.78
• 2b = 11.58
• b = 11.58/2
• b = 5.79