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    Question

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    A 312 Correct Answer Incorrect Answer
    B 234 Correct Answer Incorrect Answer
    C 300 Correct Answer Incorrect Answer
    D 280 Correct Answer Incorrect Answer

    Solution

    Let the total students be x ⇒ Boys = 5x/8, Girls = 3x/8 ⇒ Boys above age 10 = 2/3 of Total boys = 5x/12 ⇒ Girls above age 10 = 1/3 of Total girls = x/8 ⇒ 5x/12 + x/8 = 260 ⇒ x = 480 ∴ Total boys = 5x/8 = 300

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