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percentage problem

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1 Answer

lets take

X= Number of books that sylvia sold = 100%

Now, Sam's sold 15% more books than sylvia which makes it that sam's sold (100%+15%) =115%

when taking % off( simply you devide by 100-----> 115/100 =1.15) that amount of books sold by Sam's =1.15X

1.15x=69 books

X=60= number of books sold by Sylvia.