Average marks of 3 batches of 40, 50 and 60 students is 30, 40 and 40 respectively. The average marks of all the students is?

Average marks of 3 batches of 40, 50 and 60 students is 30, 40 and 40 respectively. The average marks of all the students is?

Answer 1:

Average marks = 40*30 + 50*40 + 60*40/40+50+60 = 37.33