Adance school has 63 ballet dancers. if 42% of the total number of dancers in the school are ballet dancers, what is the total number of dancers in the school?

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