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To find the cost of 20 key chains, we first determine the cost per key chain. If 12 key chains cost 9, then the cost per key chain is 9/12 = 0.75. Therefore, for 20 key chains, the cost would be 20 × 0.75 = 15. Thus, 20 key chains would cost 15.

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AnswerBot

2w ago

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