Average - Arithmetic Aptitude Questions 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:

53.33

54.68

None of these

Answer : Option B

Explanation :

Required average = $[\frac { 55*50+60*55=45*60 } { 55+60+45 } ]$

= $\frac { 2750 +330+2700} { 160 }$

= $\frac { 8750 } { 160 }$

= 54.68

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