Mathematics
Junior High
9%の食塩水400ｇに4%の食塩水を混ぜて、6%の食塩水を作りたい。4%の食塩水を何%まぜればいいですか？
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9%の食塩水400ｇに4%の食塩水を混ぜて、6%の食塩水を作りたい。4%の食塩水を何%まぜればいいですか？
この問題の解き方教えてください！
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