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Home Aptitude Chain Rule Comments

  • Question
  • Some persons can do a piece of work in 12 days. Two times the number of such persons will do half of that work in


  • Options
  • A. 6 days
  • B. 12 days
  • C. 4 days
  • D. 3 days

  • Correct Answer
  • 3 days 

    Explanation

    Let x men can do the in 12 days and the required number of days be z

     

    More men, Less days     [Indirect Proportion]

     

    Less work, Less days     [Direct Proportion  ]

      m e n 2 x : x w o r k 1 : 1 2   : :   12   :   z

    ? 2 x × 1 × z = x × 1 2 × 12

      ? z = 3


  • Chain Rule problems


    Search Results


    • 1. The sum of 3rd and 15th elements of an arithmetic progression is equal to the sum of 6th, 11th and 13th elements of the same progression. Then which element of the series should necessarily be equal to zero ?

    • Options
    • A. 14th element
    • B. 9th element
    • C. 12th element
    • D. 7th element
    • Discuss
    • 2. If a quarter kg of carrots costs 60 paise, how many paise will 200 gms cost ?

    • Options
    • A. 78 paise
    • B. 48 paise
    • C. 54 paise
    • D. 62 paise
    • Discuss
    • 3. 36 men can complete a piece of work in 18 days. In how many days will 27 men complete the same work ?

    • Options
    • A. 24 days
    • B. 28 days
    • C. 34 days
    • D. 35 days
    • Discuss
    • 4. If 18 bindres bind 900 books in 10 days , How many binders will be required to bind 660 books in 12 days?

    • Options
    • A. 22
    • B. 14
    • C. 13
    • D. 11
    • Discuss
    • 5. 3 pumps working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

    • Options
    • A. 9
    • B. 10
    • C. 11
    • D. 12
    • Discuss
    • 6. In a queue, Shankar is ninth from the rear end. Althaf's place is eighth from the front. Nitu is standing between the two. What could be the minimum numbers of boys standing in the queue ?

    • Options
    • A. 18
    • B. 14
    • C. 22
    • D. 24
    • Discuss
    • 7. If a person having Rs. 2000 and he want to distribute this to his five children in the manner that each son having Rs. 30 more than the younger one , what will be the share of youngest child ?

    • Options
    • A. Rs. 175
    • B. Rs. 325
    • C. Rs. 340
    • D. Rs. 260
    • Discuss
    • 8. If 8 men can reap 80 hectares in 24 days , then how many hectares can 36 men reap in 30 days?

    • Options
    • A. 350
    • B. 400
    • C. 425
    • D. 450
    • Discuss
    • 9. A wheel that has 6 cogs is meshed with a larger wheel of 14 cogs. When the smaller wheel has made 21 revolutions, then the number of revolutions mad by the larger wheel is:

    • Options
    • A. 4
    • B. 9
    • C. 12
    • D. 49
    • Discuss
    • 10. A fort had provision of food for 150 men for 45 days. After 10 days, 25 men left the fort. The number of days for which the remaining food will last, is:

    • Options
    • A. 29
    • B. 37
    • C. 42
    • D. 54
    • Discuss


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