Placement Average Problem 7

Placement Average Problem 7

A student on his birthday distributed on an average 5 chocolates per student. If on the arrival of the teacher and the headmaster to whom the student gives 10 and 15 chocolates respectively, the average chocolate distributed per head increases to 5.5, then what is the strength of the class?

  1. 28

  2. 30

  3. 32

  4. None of these