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Home Aptitude Chain Rule Comments

  • Question
  • A flagstaff 17.5 m high casts a shadow of length 40.25 m. The height of the building, which casts a shadow of length 28.75 m under similar conditions will be:


  • Options
  • A. 10 m
  • B. 12.5 m
  • C. 17.5 m
  • D. 21.25 m

  • Correct Answer
  • 12.5 m 

    Explanation
    Let the height of the building x metres.

    Less lengthy shadow, Less in the height (Direct Proportion)

    ∴ 40.25 : 28.75 :: 17.5 : x    ⟺    40.25 x x = 28.75 x 17.5

    x = 28.75 x 17.5
    40.25

    x = 12.5


  • Chain Rule problems


    Search Results


    • 1. 4 mat-weavers can weave 4 mats in 4 days. At the same rate, how many mats would be woven by 8 mat-weavers in 8 days?

    • Options
    • A. 4
    • B. 8
    • C. 12
    • D. 16
    • Discuss
    • 2. 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
    • 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. 12
    • B. 18
    • C. 22
    • D. 24
    • E. None of these
    • Discuss
    • 4. In a dairy farm, 40 cows eat 40 bags of husk in 40 days. In how many days one cow will eat one bag of husk?

    • Options
    • A. 1
    • B. 1140
    • C. 40
    • D. 80
    • Discuss
    • 5. 
      If x = 3 + 2√2, then the value of x - 1 is:
      x

    • Options
    • A. 1
    • B. 2
    • C. 2√2
    • D. 3√3
    • Discuss
    • 6. An industrial loom weaves 0.128 metres of cloth every second. Approximately, how many seconds will it take for the loom to weave 25 metres of cloth?

    • Options
    • A. 178
    • B. 195
    • C. 204
    • D. 488
    • Discuss
    • 7. If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

    • Options
    • A. 1
    • B. 72
    • C. 7
    • D. 49
    • Discuss
    • 8. 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. 20
    • B. 30
    • C. 40
    • D. 50
    • 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. If the cost of x metres of wire is d rupees, then what is the cost of y metres of wire at the same rate?

    • Options
    • A. Rs. (xyd)
    • B. Rs. (xd)
    • C. Rs. (yd)
    • D. Rs. (ydx)
    • Discuss


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