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Let, number of book and number of pen sold by shopkeeper be 17x and 12x respectively. Number of pencil sold by shopkeeper = 7/3 × 12x = 28x So, 17x × 40 + 12x × 20 + 28x × 10 = 21600 ⇒ 680x + 240x + 280x = 21600 ⇒ 1200x = 21600 x = 18 Number of pen sold by shopkeeper = 12x = 216
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