Asked by aruni_maiyer | 19th May, 2010, 02:40: PM
let num of books be x
so cost of each book is 80/x
if he had bought 4 more books then number of books=x+4
cost of each book in that case=80/(x+4)
Solving we get
x=16, as negative num can't be taken for number of books.
so, he bought 16 books.
Answered by | 19th May, 2010, 03:38: PM
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