Question
Ratio of number of books to number of pens sold by a shopkeeper is 25:18, respectively while ratio of number of pens to number of pencils sold by the same shopkeeper is 6:13, respectively. If price of each book, each pen and each pencil is Rs. 40, Rs. 20, and Rs. 10 respectively then revenue generated by shopkeeper is Rs. 21000. Find the number of pens sold by shopkeeper.
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