For a field trip, 20 students rode in cars and the rest filled ten buses. How many students were in each bus if 500 students were on the trip?

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