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    Question

    A borewell of 28m base radius is digged upto a depth of

    21m and 14m wide platform was made around the well. Find the height of platform?
    A 12.8 m Correct Answer Incorrect Answer
    B 16.8 m Correct Answer Incorrect Answer
    C 25.8 m Correct Answer Incorrect Answer
    D 8.2 m Correct Answer Incorrect Answer

    Solution

    Volume of cylinder = 22/7 × (28)² × 21 = 51,744 Area of the platform to be filled = π (42)² - π (28)² = π × 70 × 14  [since volume will be the same]  ⇒ 22/7 × 70 × 14 × h = 51,744   ⇒ h = 16.8m

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