17♀だけど数学がんばってるお兄ちゃんたち●●
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0356１３２人目の素数さん
2007/09/23(日) 21:46:41>>1
In hall A, 30% of 800 people were men. In hall B, 40% of the 400 people were women and children.
After some of the people in both halls had switched hall, 25% of the people in hall A and 75% of those in hall B were men.
How many people were in hall B after the change?
tuini ending nano?
■ このスレッドは過去ログ倉庫に格納されています