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    Question

    A quantity x is directly proportional to another

    quantity y. When x = 56, then y = 28. When y = 45, then find the value of x.
    A 90 Correct Answer Incorrect Answer
    B 72 Correct Answer Incorrect Answer
    C 84 Correct Answer Incorrect Answer
    D 96 Correct Answer Incorrect Answer

    Solution

    x ∝ y, which means, when 'x' increases then 'y' will also increase and when 'x' decreases then 'y' will also decrease. So, Let, x = k X y (where, 'k' is a proportionality constant) ATQ,
    56 = k X 28 So, k = (56/28) = 2 When 'y' = 45, then,
    x = 2 X 45 = 90 Hence, option a.

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