Average | Aptitude Question and answers

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

 

 

 

READ  A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the boy interchanges the digits of one number say ba for ab. Due to this, the average becomes 1.8 less than the previous one. What was the difference of the

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