Answer:
30 shirts
Step-by-step explanation:
We know the cost of the shirts was p x 15
We also know she received a $50 discount which we can write as:
(p x 15) - 50 or 15p-50
And we know she spent $400 so we can write:
15p -50 = 400
add 50 to each side 15p=450
divide each side by 15p/15 = 450 /15
p = 30
