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Average - General Aptitude

Q1:

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

A 53.33

B 54.68

C 55

D None of these

ANS:B - 54.68

Required average
= 55 x 50 + 60 x 55 + 45 x 60
55 + 60 + 45
 
= 2750 + 3300 + 2700
160
 
= 8750
160
  = 54.68