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    Question

    If ‘r’ increases directly as ‘s’, and when r = 120,

    s = 30, then what will be the value of ‘r’ when ‘s’ = 45?
    A 132 Correct Answer Incorrect Answer
    B 240 Correct Answer Incorrect Answer
    C 180 Correct Answer Incorrect Answer
    D 272 Correct Answer Incorrect Answer

    Solution

    ATQ,

    r ∝ s

    So, Let, r = k × s (where, ‘k’ is a proportionality constant)

    ATQ,

    120 = k × 30

    So, k = (120 / 30) = 4

    So, when ‘s’ = 45, then,

    r = 4 × 45 = 180

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