作者comeonbabies (宅什麽, 马子都不马子了)
看板GMAT
标题[计量] 七月JJ 31题
时间Sat Jul 25 22:10:30 2009
31 In a 100 pounds fruit, 99% is water. After dehydrating, the water
content is 98%, the weight of fruit content remains unchanged, what is the
weight of the fruit?
CD上提供的解法: originally 1 pound is the weight of the fruit content, assume
x is the water content after hydration, then x/(1+x) = 0.98, x=49,
answer = 50 pounds
疑问: weight of fruit 不是100*(1-99%)=1 吗? dehydrating前跟後fruit量不都是没变,
变的只有水而已吧? 不知道位何要如此作答, 请高手解答小第疑惑, 谢谢
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