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혼합: R$ 30/kg 커피 200g + R$ 50/kg 커피 x g = R$ 38/kg 혼합물. x 를 구하라
혼합: R$ 30/kg 커피 200g + R$ 50/kg 커피 x g = R$ 38/kg 혼합물. x 를 구하라
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