At the end of school, josh's teacher handed out 27 coupons for bowling during the summer to each student. the third week of summer, he accidentally threw away 12 of them when he cleaned his room. the last week of summer, he decided to use the remaining coupons evenly over 3 days. if he did not use any of the coupons until the last week of summer, how many coupons did he use on each of the 3 days?