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  • Question
  • A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:


  • Options
  • A. 10
  • B. 20
  • C. 40
  • D. 73

  • Correct Answer
  • 40 

    Explanation
    Let there be x pupils in the class.
    Total increase in marks = x x 1 = x
    2 2

    x = (83 - 63)   ⟹ x = 20    ⟹  x= 40.
    2 2

  • Average problems


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    • 1. The average age of husband, wife and their child 3 years ago was 27 years and that of wife and the child 5 years ago was 20 years. The present age of the husband is:

    • Options
    • A. 35 years
    • B. 40 years
    • C. 50 years
    • D. None of these
    • Discuss
    • 2. 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?

    • Options
    • A. 76 kg
    • B. 76.5 kg
    • C. 85 kg
    • D. Data inadequate
    • E. None of these
    • Discuss
    • 3. A library has an average of 510 visitors on Sundays and 240 on other days. The average number of visitors per day in a month of 30 days beginning with a Sunday is:

    • Options
    • A. 250
    • B. 276
    • C. 280
    • D. 285
    • Discuss
    • 4. The average weight of 16 boys in a class is 50.25 kg and that of the remaining 8 boys is 45.15 kg. Find the average weights of all the boys in the class.

    • Options
    • A. 47.55 kg
    • B. 48 kg
    • C. 48.55 kg
    • D. 49.25 kg
    • Discuss
    • 5. A car owner buys petrol at Rs.7.50, Rs. 8 and Rs. 8.50 per litre for three successive years. What approximately is the average cost per litre of petrol if he spends Rs. 4000 each year?

    • Options
    • A. Rs. 7.98
    • B. Rs. 8
    • C. Rs. 8.50
    • D. Rs. 9
    • Discuss
    • 6. A cistern 6m long and 4 m wide contains water up to a depth of 1 m 25 cm. The total area of the wet surface is:

    • Options
    • A. 49 m2
    • B. 50 m2
    • C. 53.5 m2
    • D. 55 m2
    • Discuss
    • 7. A boat having a length 3 m and breadth 2 m is floating on a lake. The boat sinks by 1 cm when a man gets on it. The mass of the man is:

    • Options
    • A. 12 kg
    • B. 60 kg
    • C. 72 kg
    • D. 96 kg
    • Discuss
    • 8. How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 8 m x 6 m x 22.5 cm?

    • Options
    • A. 5600
    • B. 6000
    • C. 6400
    • D. 7200
    • Discuss
    • 9. A right triangle with sides 3 cm, 4 cm and 5 cm is rotated the side of 3 cm to form a cone. The volume of the cone so formed is:

    • Options
    • A. 12Π cm3
    • B. 15Π cm3
    • C. 16Π cm3
    • D. 20Π cm3
    • Discuss
    • 10. The curved surface area of a cylindrical pillar is 264 m2 and its volume is 924 m3. Find the ratio of its diameter to its height.

    • Options
    • A. 3 : 7
    • B. 7 : 3
    • C. 6 : 7
    • D. 7 : 6
    • Discuss


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