Averages Questions and Answers


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A family consists of two grandparents, two parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family?


A. 28 4/7
B. 31 5/7
C. 32 1/7
D. None of these

Answer & Explanation:

Answer: Option B

Explanation:

Averages Questions and Answers


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A grocer has a sales of Euro 6435, Euro 6927, Euro 6855, Euro 7230 and Euro 6562 for 5 consecutive months. How much sale must he have in the sixth month so that he gets an average sale of Euro 6500?


A. Euro 4991
B. Euro 5991
C. Euro 6001
D. Euro 6991

Answer & Explanation:

Answer: Option A

Explanation: Total sale for 5 months = Euro (6435 + 6927 + 6855 + 7230 + 6562) = Euro 34009.

Required sale = Euro [ (6500 x 6) - 34009 ]

= Euro (39000 - 34009)

= Euro 4991.



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The average of 20 numbers is zero. Of them, at the most, how many may be greater than zero?


A. 0
B. 1
C. 10
D. 19

Answer & Explanation:

Answer: Option D

Explanation: Average of 20 numbers = 0. Sum of 20 numbers (0 x 20) = 0. It is quite possible that 19 of these numbers may be positive and if their sum is a then 20th number is (-a).



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The average weight of 8 person's increases by 2.5 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?


A. 76 kg
B. 76.5 kg
C. 85 kg
D. Data inadequate
E. None of these

Answer & Explanation:

Answer: Option C

Explanation: Total weight increased = (8 x 2.5) kg = 20 kg.

Weight of new person = (65 + 20) kg = 85 kg.



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The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded, the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?


A. 23 years
B. 24 years
C. 25 years
D. None of these

Answer & Explanation:

Answer: Option A

Explanation: Let the average age of the whole team by x years.

11x - (26 + 29) = 9(x -1)

11x - 9x = 46

2x = 46

x = 23.

So, average age of the team is 23 years.



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