প্রশ্ন সংশোধন করুন
প্রশ্ন:
If the average marks of three batches of 55,60 and 45 students respectively is 50,55 and 60, then the average marks of all the students is:
If the average marks of three batches of 55,60 and 45 students respectively is 50,55 and 60, then the average marks of all the students is: