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    Question

    The present average age of ‘X’ and ‘Y’ is 45

    years, present average age of ‘X’ and ‘Z’ is 32 years and present average age of ‘Y’ and ‘Z’ is 9 years. Find the present age of ‘X’
    A 60 yrs Correct Answer Incorrect Answer
    B 55 yrs Correct Answer Incorrect Answer
    C 68 yrs Correct Answer Incorrect Answer
    D 45 yrs Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    According to the question, Present ages of (X + Y) = 45 × 2 = 90…. (1) Than, the Present ages of (X + Z) = 32 × 2 = 64…. (2) Than, the Present ages of (Y + Z) = 12 × 2 = 18….. (3) Therefore From equations (1), (2) and (3), we get Present ages of (X + Y + Z) = (90 + 64 + 18)/2 = 86 years Therefore From equation (3)we will get the, present age of ‘X’ = 86 – 18 = 68 years

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