Average Questions and answers

  1. Aptitude
    1. Compound interest
    2. Boat and Stream
    3. Trains
    4. Percentage
    5. Discount
    6. Mixture and Allegation
    7. Unitary Method
    8. Work and Wages
    9. Pipes and Cisterns
    10. Linear Equations
    11. Approximation
    12. Word problems
    13. Number System
    14. Time and Distance
    15. Average
    16. Ratio and Proportions
    17. Profit and Loss
    18. Partnership
    19. Permutation and combination
    20. Probability
    21. Problem on ages
    22. Time and work
    23. Simple and compound interest
    24. Mensuration
    25. Number series
1). The average for first 50 natural numbers is
A). 22.25
B). 24.25
C). 25
D). 25.5
2). The mean of \( \large 1^2, 2^2,3^2,4^2,5^2,6^2 ....... 50^2 \) is
A). 850.5
B). 858.5
C). 854.5
D). 852.5
3). The average of eight numbers is 14. The average of six of these numbers is 16. The average of the remaining two numbers is
A). 14
B). 8
C). 16
D). 12
4). The average price of three items of furniture is Rs. 15000.If their prices are in the ratio 3 : 5 : 7, then the price of cheapest item is
A). Rs. 9000
B). Rs. 5000
C). Rs. 8000
D). Rs. 10000
5). Mr.Danny spends Rs.10000 monthly on average for the first four months and Rs.12000 monthly for the next eight months and saves Rs.26000 a year. His average monthly income is
A). Rs. 12500
B). Rs. 14500
C). Rs. 13500
D). Rs.1400


6). The mean of 100 observations was calculates as 35. It was found later on that one of the observations was misread as 73 instead of 37. The correct mean is
A). 33.64
B). 34.64
C). 32.64
D). 64.34
7). In seven given numbers, the average of first four numbers is 4 and that of the last four numbers is also 4. If the average of these seven numbers is 3 , then the fourth number is
A). 9
B). 8
C). 10
D). 11
8). Rambabu has twice as much as Santosh and Santosh has 50% more money that what Sunil has. If average money with them is Rs.110, then Rambabu has
A). Rs. 160
B). Rs. 175
C). Rs. 170
D). Rs. 180
9). The average age of 30 students is 9 years. If age of their teacher is included, it becomes 10 years. The age of teacher (in years) is
A). 27 years
B). 31 years
C). 35 years
D). 40 years
10). The average weight of 8 men is increased by 1.5kg when one of the men who weighs 65 kg is replaced by a new man. The weight of the new man is
A). 76 kg
B). 76.5 kg
C). 76.7 kg
D). 77 kg
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