a milliner bought a lot of hats, 1/4 of which were brown. The milliner sold 2/3 of the hats including 4/5 of the brown hats. what fraction of the unsold hats were brown.
我原来的做法是设总共小贩买进帽子S，则未买出的棕色帽子有S（1/4－2/3×4/5）结果算出负数，请教高手，我哪里理解错了呢？为什么答案是1/4×（1－4/5）=1/20?
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我明白了各位，不好意思打扰了
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发表于 2006-9-4 16:03:00
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