→ broniee:thanks! 08/18 14:48
※ 引述《broniee (布朗尼)》之銘言：
: 307 PS: In a research, 15% of the plants ( developed fungus and died ), 40%
: of the plants ( who developed fungus but not died ), what is the percentage
: of the plants developed fungus?
: A. 25%
: B. 27%
: C. 35%
: D. 40%
: E. 55%
: CD上給的答案是55%, 可是我自己算出的結果是25%
: 式子如下:
: 假設 X%=percentage of the plants developed fungus
: 則感染fungus且有死掉的 = 15% = X%（1-40%）
: 求出 X%=25%
: 但是不確定這樣是否正確...
: 是否把題目想得太複雜?
: 還請會的人幫忙解釋!!
: Thanks!
has fungus not has fungus
die 15% x%
not die 40% y%
question asks what total % has fungus ------15+40 %
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