Re: [計量] 七月JJ 31題
※ 引述《comeonbabies (宅什麼, 馬子都不馬子了)》之銘言：
: 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
: 疑問: weight of fruit 不是100*(1-99%)=1 嗎? dehydrating前跟後fruit量不都是沒變,
: 變的只有水而已吧? 不知道位何要如此作答, 請高手解答小第疑惑, 謝謝
fruit isn't equivalent to fruit content
fruit = water content + fruit content
(W) (F)
before dehydrating
100 = 99 + 1
after
X = 0.98X + 1
(F unchanged)
→0.02X = 1
X = 50
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