Answer:
12x + 15y < 120
Step-by-step explanation:
We don't know exactly how many items were bought, so we have to represent those numbers with letters (x and y)
Books are $12 each, so the total cost of books = 12x
DVDs are $15 each, so the total cost of DVDs = 15y
We know that some books and DVDs were bought: 12x + 15y
And the total amount spend was less than $120: <120
So 12x + 15y < 120
