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    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.
    A 195 Correct Answer Incorrect Answer
    B 180 Correct Answer Incorrect Answer
    C 216 Correct Answer Incorrect Answer
    D 240 Correct Answer Incorrect Answer
    E 270 Correct Answer Incorrect Answer

    Solution

    Let, number of book and number of pens sold by shopkeeper be 25x and 18x respectively. Number of pencils sold by shopkeeper = 13/6 ├Ч 18x = 39x So, 25x ├Ч 40 + 18x ├Ч 20 + 39x ├Ч 10 = 21000 тЗТ 1000x + 360x + 390x = 21000 тЗТ 1750x = 21000 x = 12 Number of pens sold by shopkeeper = 18x = 216

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