Mary had $18.
She bought a movie ticket, a box of popcom, and a drink.
The movie ticket cost $7, and the drink cost $4.
If Mary has $3 left after the movies,
how much did the bax of popcorn cost?
Movie ticket + Popcorn + Drink = 18
7 + Popcorn + 4 = 18
Popcorn = 18 - 7 - 4
Popcorn = 7
Answer:
Popcorn cost is $7