Mathematics
Senior High
解説お願いします
問264%の食塩水に食塩を加えて、 20%の食塩水を960g 作りました。
4% の食塩水は何g 必要か求めなさい。
解答群
① 140g
② 400g
800g
④ 810g
⑤ 960g
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