Question
If (5000) 5 = 3.125Â
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?Solution
(5000)5 = 3.125Â 
10k or (5 103)5 = Â 10k or 55 1015 = 55 Â 10(k-3) or 1015 = 10(k-3) or k = 15+3 = 18
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