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  • Question
  • A circular road runs rounds a circular ground. If the difference between the circumference of the outer circle and the inner circle is 66 meters, the width of the road is?


  • Options
  • A. 21 meters
  • B. 10.5 meters
  • C. 7 meters
  • D. 5.25 meters

  • Correct Answer
  • 10.5 meters 

    Explanation

    Let outer radius be R and inner radius be r.
    Then from question
    2?R - 2?r = 66
    ? 2? (R-r) = 66
    ? (2 x 22)/7 x (R - r) = 66
    ? (R-r) = (66 x 7) / 44
    = 10.5 m


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    • 2. 
      .02 =(......?.....)%

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    • A. 20
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    • 3. 
      If 36 men can do a piece of work in 25 hours, in how many hours will 15 men do it?

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    • 4. 
      2?63 / 11 =233

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    • A. 4
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    • 5. 
      When 121012 is divided by 12, the remainder is

    • Options
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    • 9. 
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