First, you would do 15 divided by 6, since you want to find out how much one ticket costs. 15 ÷ 6 = 2.5. So, each ticket costs $2.5. Now, you would multiple 2.5 by 9. 2.5 x 9 = 22.5. The chess club members would have to pay $22.50 if all 9 members wanted to go to the tournament.
