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    Question

    The average of two numbers is 25, and the square root of

    their product is 20. What is the difference between the two numbers?
    A 20 Correct Answer Incorrect Answer
    B 15 Correct Answer Incorrect Answer
    C 30 Correct Answer Incorrect Answer
    D 25 Correct Answer Incorrect Answer

    Solution

    Let the two numbers = a and b          Given – Average of numbers = (a + b)/2 = 25 a + b = 50        ...(I) square root of these numbers = √  ab = 20 squaring both sides ab = 400 So now – (a + b)2 = (a- b)2 + 4ab (50)2 – 4 ×400 = (a-b)2 (a-b)2 =2500- 1600 = 900   a – b = 30.

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