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    Question

    If the average of two numbers is 13 and the square root

    of their product is 12, then the difference between the numbers is:
    A 10 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 8 Correct Answer Incorrect Answer
    D 12 Correct Answer Incorrect Answer

    Solution

    Sum of the numbers = 13 ├Ч 2 = 26 Let the two numbers be a and b So, (a + b) = 26┬а ┬а ┬а ----(i) Now, тИЪab = 12 тЗТ (тИЪab)2 = 122 тЗТ ab = 144 Now, (a + b)2 = 262 тЗТ a2 + b2 + 2ab = 676 тЗТ a2 + b2 + 2ab - 4ab = 676 - 4 ├Ч 144 тЗТ a2 + b2 - 2ab = 676 - 576 тЗТ (a - b)2 = 100 тЗТ (a - b) = 10┬а ┬а ┬а ----(ii) From eq (i) and eq (ii) we can say a = 18 and b = 8 Now, Difference of the two numbers = 18 - 8 тЗТ 10 тИ┤ The difference between the numbers is 10.

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