Answer:
The total number of lunch boxes is 11.
⇒ 4.25x + 7 = 53.75 (equation)
Explanation:
If 1 lunch box costs $ 4.25
x lunch boxes costs x × 4.25 = 4.25x
Janie paid a total of $ 53.75 including delivery
⇒ 4.25x + 7 = 53.75 (equation)
4.25x = 53.75 - 7
4.25x = 46.75
∴x =
= 11
Therefore, Janie bought 11 boxes.