Question

3 packets of French fries, 2 cheeseburgers, and one drink cost $10.95. 1 packet of French fries, 2 cheeseburgers, and 3 drinks cost $11.25. Find the price of 1 packet of French fries, 1 cheeseburger, and one drink?

Answer 1

The price of 1 packet of French fries, 1 cheeseburger, and one drink cost $5.55

Explanation:

Let

x ----> the price of 1 packet of French fries

y ---> the price of 1 cheeseburger

z ---> the price of one drink

we know that

`3x+2y+z=10.95` ----> equation A

`x+2y+3z=11.25` ---> equation B

Adds equation A and equation B

`3x+2y+z=10.95\\x+2y+3z=11.25\\------------\\3x+x+2y+2y+z+3z=10.95+11.25\\4x+4y+4z=22.2`

Divide both sides of the equation by 4

`x+y+z=5.55` ----> equation C

The equation C means ----> The price of 1 packet of French fries, 1 cheeseburger, and one drink cost $5.55