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Eですね。
100g/消毒液の質量×100=80.0
100g/消毒液の質量=0.80
100g=0.80×消毒液の質量
消毒液の質量=100g÷0.80
=125g

みそだる

0.80=4/5⬅︎これを使うと計算が楽ですよ。

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