Question

The local restaurant has the following offers:

2 sandwiches and juice
€5.00
OFFER A
Sandwich and salad
€5.10
OFFER B
Salad and juice
€5.30
OFFER C

What is the cost of one sandwich?


What is the cost of 1 sandwich 1 salad and 1 juice?

Answer 1

Below in bold.

Explanation:

Let cost of sandwich = s, juice = j and salad = d.

2s + j = 500 (A)

s + d = 510 (B)

d + j = 530 (C)

Equation (C) - (B) ( to eliminate d):

j - s = 20 (D)

(A) - (D) = (to eliminate j):

2s - (-s) = 480

3s = 480

s = 160

A sandwich costs E 1.60.