You raised a total of $102 in the car wash, making that the maximum you could spend. If soccer balls are $18 each, you have to use a variable (s goes with soccer, but you could use any letter) for how many you can buy.
Your equation would be 18s = 102.
Divide by 18 on both sides.
18s / 18 = s
102 / 18 = 5 2/3
Because the 2/3 of a dollar won't pay for a whole soccer ball, you round down to 5.
Your answer would be s = 5 soccer balls.
Hope this helps you! :)
