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    Question

    Priya's marks in Chemistry are 20% higher than her marks in

    Physics. The average of her marks in Chemistry, Physics, and Biology is 84. If she scored 87 in Biology, find her marks in Physics.
    A 75 Correct Answer Incorrect Answer
    B 40 Correct Answer Incorrect Answer
    C 80 Correct Answer Incorrect Answer
    D 30 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Total marks in Chemistry, Physics, and Biology = 84 × 3 = 252

    Marks in Chemistry and Physics = 252 – 87 = 165

    Let the marks in Physics be ‘x’.

    Then marks in Chemistry = 1.2x

    So, x + 1.2x = 165

    2.2x = 165

    x = 165 / 2.2

    x = 75

    So, marks in Physics = 75 marks

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