Let, number of book and number of pen sold by shopkeeper be 23x and 15x respectively. Number of pencil sold by shopkeeper = 8/3 × 15x = 40x So, 23x × 40 + 15x × 20 + 40x × 10 = 22680 ⇒ 920x + 300x + 400x = 22680 ⇒ 1620x = 22680 x = 14 Number of pen sold by shopkeeper = 15x = 210
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