The chess club members bought 6 tickets for 15$ how much for 9 members

Set up a proportion to solve.

If 6 tickets are for one club, meaning that the total amount of people in that club are 6.

6/15 = 9/x

Cross Multiply

6*x = 6x

9*15 = 135

6x = 135

Now we need to solve for x by isolating the variable.

6x/6 = 135/6

x = 135/6

x = 22.50

Answer: It will cost $22.50 for 9 members.