Brian buys 5 cookies and 1 bottle of water. The total cost is $8.75. If the bottle of water costs $1.25, which equation can be used to determine the cost of 1 cookie?
You have to subtract $1.25 from $8.75 to get $7.50. Since he bought 5 cookies, you need to divide $7.50/5 to get $1.50. So, the cost of each cookie is $1.50
