Quiz Discussion

The average age of a class is 15.8 years. The average age of the boys in the class is 16.4 years while that of the girls is 15.4 years. What is the ratio of boys to girls in the class?

Course Name: Quantitative Aptitude

  • 1]

    1:2

  • 2]

    2:3

  • 3]

    3:4

  • 4]

    3:5

Solution
No Solution Present Yet

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# Quiz
1
Discuss

The speed of the train going from Nagpur to Allahabad is 100 km/h while when coming back from Allahabad to Nagpur, its speed is 150 km/h. find the average speed during whole journey.

 

  • 1] 125 km/hr
  • 2] 75 km/hr
  • 3] 135 km/hr
  • 4] 120 km/hr
Solution
2
Discuss

A student finds the average of 10, 2 digits numbers. If the digits of one of the numbers interchanged, the average increases by 3.6. The difference between the digits of the 2 digits number is :

  • 1] 4
  • 2] 3
  • 3] 2
  • 4] 5
Solution
3
Discuss

David obtained 76, 65, 82, 67 and 85 marks (out of 100) in English, mathematics, physics, chemistry and biology. What are his average marks?

  • 1] 65
  • 2] 69
  • 3] 75
  • 4] None of these
Solution
4
Discuss

The average of runs of a cricket player of 10 innings was 32. How many runes must be made in his next innings so as to increase his average of runs by 4?

  • 1] 72
  • 2] 74
  • 3] 70
  • 4] 76
Solution
5
Discuss

Find the average of all prime numbers between 30 and 50.

  • 1]

    37.8

  • 2]

    38.9

  • 3]

    39.8

  • 4]

    42.8

Solution
6
Discuss

A man has 'n' magical eggs whose average weight is 'k' gm. Each of the 'n' eggs produces 'n' eggs next day such that the average weight of 'n' eggs produced is same as that of the parental egg for each 'n' groups individually i.e. each egg produces 'n' eggs of next generation and average weight of all the 'n' eggs of next generation is same as the weight of the mother egg. This process is continued without any change in pattern. What is the total weight of all the eggs of rth generation, where the initial number of eggs with man are considered as the eggs of first generation.

  • 1] rnk
  • 2] rnk
  • 3] nkr
  • 4] nrk
  • 5] None of these
Solution
7
Discuss

The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean of the whole week is 25.2°C then the temperature of the 4th day is :

  • 1] 25°C
  • 2] 25.2°C
  • 3] 25.6°C
  • 4] 25.5°C
Solution
8
Discuss

A man started his journey from Lucknow to Kolkata, which is 200 km, at the speed of 40 kmph then he went to Banglore which is 300 km, at the speed of 20 kmph. Further he went to Ahmedabad which is 500 km, at the speed of 10 kmph. The average speed of the man is :

  • 1]

    kmph

  • 2]

    Kmph

  • 3]

    15.6 kmph

  • 4]

    16.1 kmph

Solution
9
Discuss

If the mean of 4 observations is 20, when a constant 'c' is added to each observation, the mean becomes 22. The value of c is :

  • 1]

    6

  • 2]

    -2

  • 3]

    2

  • 4]

    4

Solution
10
Discuss

The average age of 20 boys in a class is 12 years. 5 new boys are admitted to the class whose average age is 7 years. The average age of all the boys in the class becomes:

  • 1] 8.2 years
  • 2] 9.5 years
  • 3] 12.5 years
  • 4] 11 years
Solution
# Quiz