30 pens and 75 pencils were purchased for 510. If the average price of a pencil was 2.00, find the average price of a pen.\nOptions:\n(A) 10\n(B) 11\n(C) 12\n(D) 13\n(E) 14 OK. Let's think. Some random thoughts first:
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Since average price of a pencil = 2\n∴ Price of 75 pencils = 150\n∴ Price of 30 pens = (510 – 150) = 360\n∴ Average price of a pen = 360⁄60 = 12 The answer: (C).
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