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    Question

    If, ‘x’ varies directly as ‘y’, and when x = 56, y

    = 28, then find the value of ‘x’, when ‘y’ = 40.
    A 65 Correct Answer Incorrect Answer
    B 45 Correct Answer Incorrect Answer
    C 80 Correct Answer Incorrect Answer
    D 72 Correct Answer Incorrect Answer

    Solution

    ATQ,

    x ∝ y

    So, Let, x = k × y (where, ‘k’ is a proportionality constant)

    ATQ,

    56 = k × 28

    So, k = (56 / 28) = 2

    So, when ‘y’ = 40, then,

    x = 2 × 40 = 80

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