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    Question

    In a zoo, tiger and ostrich were counted. If heads were

    counted, there are 400 and if legs are counted there were 820. How many ostrich are there?
    A 240 Correct Answer Incorrect Answer
    B 310 Correct Answer Incorrect Answer
    C 165 Correct Answer Incorrect Answer
    D 390 Correct Answer Incorrect Answer

    Solution

    By allegation rule Average number of legs per head = `520/400` = `31/20` Tiger : Ostrich = 1 : 39 Number of ostrich = `400/40xx` 39 = 390

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