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A ratio of 2 to 3 means the whole splits into five equal parts, two of one kind and three of the other. Once you find what one part is worth, everything else follows. Confusing a part with the whole is the classic way this goes wrong.
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No indexed official paper question has been tagged with NUM-11 yet. The index grows one paper at a time, and it records only question numbers, point values and our own skill tags — never the problems themselves.