Problems on Ages
Problems on Ages - 1 Problems on Ages - 2 Problems on Ages - 3 Problems on Ages - 4Problems on Average
Problems on Average - 1 Problems on Average - 2 Problems on Average - 3Odd Man Out Series
Odd Man Out Series - 1 Odd Man Out Series - 2 Odd Man Out Series - 3 Odd Man Out Series - 4Problems on Percentage
Problems on Percentage - 1 Problems on Percentage - 2 Problems on Percentage - 3 Problems on Percentage - 4 Problems on Percentage - 5Permutation and Combination
Permutation and Combination - 1 Permutation and Combination - 2 Permutation and Combination - 3Problems on Probability
Problems on Probability - 1 Problems on Probability - 2 Problems on Probability - 3 Problems on Probability - 4Problems on Profit Loss
Profit and Loss - 1 Profit and Loss - 2 Profit and Loss - 3 Profit and Loss - 4 Profit and Loss - 5 Profit and Loss - 6Problems on Test Divisibility
Test Divisibility - 1 Test Divisibility - 2 Test Divisibility - 3Time and Work
Time and Work - 1 Time and Work - 2 Time and Work - 3The ones who are crazy enough to think they can change the world are the ones who do.- Steve Jobs
Tricky Interview Questions on Average
Average - Aptitude
11. Jiju obtained 80, 75, 77, 92 and 86 marks (out of 100) in English, Mathematics, Physics, Chemistry and Biology What are his average marks?
x
Option: C
Explanation
average =
average = 82
12. In Mari Selvan's Opinion, his weight is greater than 65 kg but less than 72 kg. His brother does not agree with Mari Selvan and he thinks that Mari Selvan's weight is greater than 60 kg but less than 70 kg. His mother's view is that his weight cannot be greater than 68 kg. If all of them are correct in their estimation, What is the average of different probable weights of Mari Selvan?
x
Option: A
Explanation
Let Mari Selvan's weight be X kg
Acoording to Mari Selvan, his weight seems to be between 65 kg and 72 kg. i.e) 65 < X < 72
Acoording to Mari Selvan's brother, his weight seems to be 60 kg and 70 kg. i.e) 60 < X < 70
Acoording to Mari Selvan's mother, his weight seems to be less than 68 kg. i.e) X < 68
from the above condition, the value's that is satisfying the conditions are 66 kg and 67 kg
Average =
13. The average of 20 numbers is zero. Of them at most, how many may be greater than zero?
x
Option: C
Explanation
there can 19 numbers greater than zero
assume sum of 19 numbers be a
20th number be - a
average =
14. If the mean of a, b, c is M and ab + bc + ca = 0, then the mean of a2, b2, c2 is:
x
Option: D
Explanation
we know that
a + b + c = 3M
squaring on both sides, (a + b + c)2 = (3M)2
a2+ b2 + c2 + 2(ab + bc + ca) = 9M2
we know that ab + bc + ca = 0, .i.e) a2 + b2 + c2 = 9M2
now, average =
15. Distance between two stations A and B is 778 km. A train covers the journey from A to B at 84 km per hour and returns back to A with a uniform speed of 56 km per hour. Find the average speed of the train during the whole journey.
x
Option: C
Explanation
Average Speed =
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