logo

CuriousTab

CuriousTab

Discussion


Home Aptitude Chain Rule Comments

  • Question
  • 2 men and 7 boys can do a piece of work in 14 days; 3 men and 8 boys can do the same in 11 days. Then, 8 men and 6 boys can do three times the amount of this work in


  • Options
  • A. 18 days
  • B. 21 days
  • C. 24 days
  • D. 30 days

  • Correct Answer
  • 21 days 

    Explanation

    (2 x 14) men +(7 x 14) boys = (3 x 11) men + (8 x 11) boys

     =>5 men= 10 boys    => 1man= 2 boys

     Therefore, (2 men+ 7 boys) = (2 x 2 +7) boys = 11 boys

     

    ( 8 men + 6 boys) = (8 x 2 +6) boys = 22 boys.

     Let the required  number of days be x.

     More boys , Less days     (Indirect proportion)

     More work , More days    (Direct proportion)

      B o y s 22 : 11 W o r k 1   :   3 ? ?   14 : x

     Therefore, (22 * 1 * x) = (11 * 3 * 14)

    => x = 21 

    Hence, the required number of days = 21


  • Chain Rule problems


    Search Results


    • 1. If 36 men can do a piece of work in 25 hours, in how mwny hours will15 men do it?

    • Options
    • A. 40
    • B. 50
    • C. 60
    • D. 70
    • Discuss
    • 2. A certain number of men can finish a piece of work in 100 days. If there were 10 men less, it would take 10 days more for the work to be finished. How many men were there originally?

    • Options
    • A. 75
    • B. 82
    • C. 100
    • D. 110
    • Discuss
    • 3. If 20 men can build a wall 56 meters long in 6 days , what length of a similar wall can be built by 35 men in 3 days?

    • Options
    • A. 46
    • B. 47
    • C. 48
    • D. 49
    • Discuss
    • 4. Mishti's birthday is on Thursday 27th April. On what day of the week will be Aradhya's Birthday in the same year, if Aradhya was born on 20th October?

    • Options
    • A. Friday
    • B. Wednesday
    • C. Saturday
    • D. Thursday
    • Discuss
    • 5. Bobby's birthday is on Monday 5th June. On what day of the week will be Pinky's Birthday in the same year if Pinky was born on 22nd September?

    • Options
    • A. Saturday
    • B. Wednesday
    • C. Friday
    • D. Sunday
    • Discuss
    • 6. If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

    • Options
    • A. 1
    • B. 3
    • C. 7
    • D. 14
    • Discuss
    • 7. A contractor undertakes to do a piece of work in 40 days. He engages 100 men at the begining and 100 more after 35 days and completes the work in stipulated time. If he had not engaged the additional men, how many days behind schedule would it be finished?

    • Options
    • A. 3
    • B. 5
    • C. 6
    • D. 9
    • Discuss
    • 8. 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
    • 9. 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
    • 10. 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


    Comments

    There are no comments.

Enter a new Comment