What is the only positive integer "n" with the property
that together 4n and 5n use each digit 1-9 exactly once?

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