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  • Question
  • 3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day should 4 pumps work in order to empty the tank in 1 day?


  • Options
  • A. 10
  • B. 12
  • C. 8
  • D. 15

  • Correct Answer
  • 12 

    Explanation

    3 pumps, can empty a tank in 2 days by working 8 hours a day.
    1 pumps, can empty a tank in 2 days by working 8 x 3 hours a day.
    1 pumps, can empty a tank in 1 days by working 8 x 3 x 2hours a day.
    4 pumps, can empty a tank in 1 days by working 8 x 3 x 2 / 4 hours a day.
    4 pumps, can empty a tank in 1 days by working 2 x 3 x 2 hours a day.
    4 pumps, can empty a tank in 1 days by working 12 hours a day.


  • Unitary Method problems


    Search Results


    • 1. 
      Cost of 1 chair is Rs. 214 and cost of one table is Rs. 937, then what is the approximate cost of 6 dozen chairs and 4 dozen tables?

    • Options
    • A. Rs. 60000
    • B. Rs. 58000
    • C. Rs. 55000
    • D. Rs. 62000
    • Discuss
    • 2. 
      Cost of
      1
      dozen of bananas is Rs. 2·35, then what is the
      4
      approximate cost of 42 dozen of bananas?

    • Options
    • A. Rs. 430
    • B. Rs. 540
    • C. Rs. 380
    • D. Rs. 400
    • Discuss
    • 3. 
      5 dozen toys are packed in a box and 98 boxes are kept in a tempo. How many tempos can lift 29400 toys in one round?

    • Options
    • A. 4
    • B. 5
    • C. 7
    • D. 6
    • Discuss
    • 4. 
      Cost of 7000 bricks is Rs. 5740. Cost of luggage to carry the bricks to the building place is Rs. 805. What is the cost at per thousand bricks?

    • Options
    • A. Rs. 900
    • B. Rs. 800
    • C. Rs. 935
    • D. Rs. 750
    • Discuss
    • 5. 
      357 mangoes cost Rs. 1517·25, then what is the approximate cost of 49 dozen of mangoes?

    • Options
    • A. Rs. 2500
    • B. Rs. 2600
    • C. Rs. 3000
    • D. Rs. 2200
    • Discuss
    • 6. 
      39 persons can repair a road in 12 days, working 5 hours a day. In how many days will 30 persons, working 6 hours a day, complete the work?

    • Options
    • A. 9
    • B. 14
    • C. 12
    • D. 13
    • Discuss
    • 7. 
      A contract is to be completed in 56 days if 104 persons work, each working at 8 hours a day. After 30 days, 25 % of the work is completed. How many additional persons should be deployed so that the work will be completed in the scheduled time, each person now working 9 hours a day.

    • Options
    • A. 60
    • B. 58
    • C. 12
    • D. 56
    • Discuss
    • 8. 
      'P' men working 'P' hours per day can do 'P' units of a work in 'P' days. How much work can be completed by 'Q' men working 'Q' hours per day in 'Q' days?

    • Options
    • A. P2Q2 units
    • B. Q3/P2 units
    • C. P2Q
    • D. Q2P2 units
    • Discuss
    • 9. 
      In a camp, there is a meal for 120 men or 200 children. If 150 children have taken the meal, how many men will be catered to with remaining meal?

    • Options
    • A. 56
    • B. 45
    • C. 30
    • D. 27
    • Discuss
    • 10. 
      10 men, working 6 hours a day can complete a work in 18 days. How many hours a day must 15 men work to complete the work in 12 days?

    • Options
    • A. 4
    • B. 3
    • C. 6
    • D. 8
    • Discuss


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