The average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60. What is the average marks of all the students?

55 students * 50 avg mark = 2750 60 * 55 = 3300 45 * 60 = 2700

Then, Adding the total marks, 2750 + 3300 + 2700 = 8750 Adding the total students 55 + 60 + 45 = 160 The average mark will be : 8750/ 160 = 54.6875

The average of the marks of maths test of 20 students is 9. If the marks of 5 new students are 9,5,3,2,1. What is the new average marks?

The average weight of 19 students was 50 kg. By the admission of a new student the average weight is reduced to 49.6 kg. What is the weight of the new student?

The average of pappu's marks in 6 subjects is 44. If his average in 5 subjects excluding Maths is 49, how many marks he obtained in Maths?

The average of Rohan's marks in 6 subjects is 69.5. If his average in 5 subjects excluding Maths is 63.5, how many marks he obtained in Maths?