If the cost of 5 copies of a book is rupees 625, what is the cost of a dozen copies of the same book?
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Cost of 5 copies of a book=625
Let the cost of 1 book be x
5x=625
x=625/5
x=125
Cost of a dozen books = 12x
12x=12×125
=1500
Cost of 12 books =1500
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