Trevor has $65 to spend at the sporting-goods store. He buys 3 cans of tennis balls for $6 each. How many $8 sports towels can Trevor buy?

O 3 towels
O 5 towels
O 6 towels
O 8 towels

Trevor spends 3 * 6 = $<<3*6=18>>18 on tennis balls.

He has 65 - 18 = $<<65-18=47>>47 left to spend.
Thus, Trevor can buy 47 / 8 = <<47/8=5.875>>5.875 or 5 sports towels.
Therefore, the answer is O 5 towels.