We know that Hunter can buy 36 baseball cards for $18, so let’s start by finding the price of 1 baseball card.
36 : 18
Divide both by 36 to get a single, or 1, baseball card.
36 / 36 = 1
18 / 36 = 0.5
The 0.5 is in terms of money, so it is equal to 0.50, or $0.50.
Troy has $9, so we must divide 9 by 0.50 to see how many cards he can get.
9 / 0.50 = 18.
So, Troy can buy 18 baseball cards with his $9.