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There were n books in a store. After 1/6th of the books were sold and 5 more books were procured, the total number of books in the shop stood at 65. What was the original number of books in the shop?

A. 72

B. 75

C. 85

D. 96

E. none of these

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Explanation: \(n-\frac{n}{6}+5=65\) \(\frac{6n-n}{6}=60\) \(\frac{5n}{6}=60\) \(5n=60\times6\) \(n=72\) (Ans. A)