The average age of a group of 10 persons was decreased by 3 years when one person, whose age was 42 years, was replaced by a new person. Find the age of the new person?

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The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is_________?

A. (mb – nc)/ (m + n) years B. (mb + nc)/ (m – n) years C. (mb + nc)/ (m + n) years D. (mb – nc)/ (m – n) years...

A batsman makes a score of 64 runs in the 16th innings and thus increased his average by 3. Find his average after the 16th inning?

A. 17 B. 29 C. 18 D. 19...

The average mark of the students of a class in a particular exam is 80. If 5 students whose average mark in that exam is 40 are excluded, the average mark of the remaining will be 90. Find the number of students who wrote the exam.

A. 20 B. 15 C. 25 D. 35...

The average of five numbers is 27. If one number is excluded, the average becomes 25. The excluded number is__________?

A. 25 B. 27 C. 30 D. 35...

The average weight of A, B and C is 45 kg. If the average weight of A and B be 40 kg and that of B and C be 43 kg, then the weight of B is___________?

A. 17 kg B. 20 kg C. 26 kg D. 31 kg...