Amy’s school is selling tickets to a choral performance. a senior citizens ticket is $6 and a child’s ticket is $15. if they made $810 dollars and sold a total of 72 child and senior tickets , how many of each ticket did they sell?

The line plot below represents the number of letters written to overseas pen pals by the students at the waverly middle school. each x represents 10 students. how many students wrote more than 6 and fewer than 20 letters. a.250 b.240 c.230 d.220