Average | Aptitude Question and answers

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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

Solutions:

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

Answer: B

 

 

 

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READ  In an examination, a student's average marks were 63. If he had obtained 20 more marks for his Geography and 2 more marks for his history, his average would have been 65. How many subjects were there in the examination?

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