Question

    A wheel goes 7920 metres in 90 rounds. What will be the

    diameter of that wheel? (Use π = 22/7)
    A 30 m Correct Answer Incorrect Answer
    B 28 m Correct Answer Incorrect Answer
    C 17 m Correct Answer Incorrect Answer
    D 36 m Correct Answer Incorrect Answer

    Solution

    ATQ,

    Distance = 7920 metres

    Circumference = 7920 ÷ 90 = 88 metres

    Let radius = x metres

    Circumference = 2πr

    ATQ:

    88 = 2 × (22/7) × x

    x = 14

    Diameter = 2 × 14 = 28 metres

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