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作者: 操！ 時間: 2010-10-3 13:47 標題: (F3)問數求解答

1)
The number of members in a health club increased by 156% and 25% respectively in 2 successive years . if the number of members in the third year returns to the original number,find the percentage change in the number of members in the third years .

2)
Tammy is 24% heavier than Jenny and Jenny is 15% lighter than Annie .
What percentage is:
A)Tammy heavier than Annie?
B)Annie lighter than TAMMY?

[ 本帖最後由操！於 2010-10-3 13:53 編輯 ]

作者: a5351451314 時間: 2010-10-3 14:28

睇唔明雞腸,幫唔到你

作者: °★sIUChC×. 時間: 2010-10-3 14:44

中文可能識既-_-

作者: 無情★殺戮 時間: 2010-10-3 14:45

樓主翻譯成中文我都可能幫到你手既

作者: A_c 時間: 2010-10-3 14:50

呢d英文小學都識睇啦,頭3位回貼唔係連小.......

作者: ★賤喱:) 時間: 2010-10-3 15:53

f.1就學左percentage

作者: 戴能獲 時間: 2010-10-3 16:55

引用:

原帖由 A_c 於 2010-10-3 14:50 發表
呢d英文小學都識睇啦,頭3位回貼唔係連小.......

睇你解答

作者: Reeve. 時間: 2010-10-3 17:17

um ... 事關小弟都有2年無讀過數 , 所以有錯請多多包涵

Q1 既然係話"increased by 156% and 25% respectively"
我地let 個original number 為 x , y為the percentage change in the number of members in the third years

so -> 1st year  : x + 1.25x = 2.25x
而2nd year 則 : 2.25x + (0.25)(2.25x) = 2.8125x
3rd year 為 :  2.8125x + (y)(2.8125x) = x
                                                            (1+y) = 0.355
                                                                  y = -0.65
->65% decreased
因為第三年係番左去原本個人數(x) , 即人數少左 ,得出黎既y係負數

作者: Reeve. 時間: 2010-10-3 17:40

Q2 我都唔知我咁答個MISS收唔收貨 , 不過都參考下la....
最簡單做法應該係是但set個數入去做 , 唔係好建議set咁多個unknown影響自己思考

我地當Tammy 100kg (咪理佢可唔可能)
當Jenny重x
100-x / 100 = 0.24 , x = 76 (Jenny重76kg)
當Annie重y
76-y/76 = -0.15 , y = 87.4 (Annie重87.4kg)
For A)Tammy heavier than Annie?
100-87.4/100 x 100% = 12.6%
For B)Annie lighter than TAMMY?
87.4-100/87.4 x 100% = -14.4%

作者: ★賤喱:) 時間: 2010-10-3 18:06

原來reeve.系神手泥

作者: Reeve. 時間: 2010-10-3 18:14

引用:

原帖由 ★賤喱 於 2010-10-3 18:06 發表
原來reeve.系神手泥

可能錯呢...
到時你就笑我7

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