Answer:
Number of roast beef sandwiches bought = 5
Step-by-step explanation:
Cost of a roast beef sandwich = $6.75
x = number of roast beef sandwiches bought
Amount Used for Payment = $50
Change Received = $16.25
Actual amount paid = Amount Used for Payment - Change Received
= $50 - $16.25
= $33.75
Actual amount paid = $33.75
Number of roast beef sandwiches bought = Actual amount paid / Cost of a roast beef sandwich
= $33.75 / $6.75
= 5 roast beef sandwiches
Number of roast beef sandwiches bought = 5