Chemistry
Senior High

ある濃度の食塩水Aと濃度13%の食塩水100gを混ぜて濃度10%の食塩水400gができた。食塩水Aの濃度と重さを求めよ。

上記の問題の解き方を教えてください。比を使えるなら使いたいです。

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