Answer:
$8
Step-by-step explanation:
The cost of your lunch added to the cost of the lunch of your friend gives the total cost stated in the bill.
If the cost of your lunch is $3.00 more than your friend's and your friend's lunch is y in $, then the cost of your lunch will be
= y + 3
The sum
= y + y + 3
= 2y + 3
Equating to the bill amount
19 = 2y + 3
2y = 19 - 3
2y = 16
y = 8
the cost of your friend's bill was $8
