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.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 × 18x = 39x So, 25x × 40 + 18x × 20 + 39x × 10 = 21000 ⇒ 1000x + 360x + 390x = 21000 ⇒ 1750x = 21000 x = 12 Number of pens sold by shopkeeper = 18x = 216
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