Question (47/66)
The average marks of three batches of 55, 60 and 45 students are 50, 55 and 60 respectively. Find the average marks of all students.(A) 53.33
(B) 54.68
(C) 55
(D) 55.55
Question (48/66)
A library has an average 510 visitors on Sunday and 240 on other days. The average number of visitors per day in a month of 30 days beginning with Sunday is ?(A) 250
(B) 276
(C) 280
(D) 285