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    Question

    If (5000) 5 = 3.125 

    src='https://static.ixambee.com/public/images/quesimg/Question Bank/Quantitative Aptitude/Surds and indices/77582_9974295.gif'>  10 k then what is the value of k?
    A 17 Correct Answer Incorrect Answer
    B 18 Correct Answer Incorrect Answer
    C 15 Correct Answer Incorrect Answer
    D 25 Correct Answer Incorrect Answer

    Solution

    (5000)5 = 3.125  10k or (5 103)5 =   10k or 55 1015 = 55  10(k-3) or 1015 = 10(k-3) or k = 15+3 = 18

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