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標題: 數學難題(百分數) [打印本頁]

作者: oscar 時間: 22/10/2004 06:31 PM
標題: 數學難題(百分數)
這題是在我第一次數學Quiz遇到的難題...
(天：你也有不懂的數學題？)
這是關於百分數的~

問題：
There are 2 drinks.
Drink A contains 40% alcohol.
Drink B contains 65% alcohol.
In what ratio should we mix to make it become a drink of 50% alcohol?

我碰對了答案是3:2，但是不懂步驟，請各高手指點...

作者: 柳絮仙 時間: 22/10/2004 06:44 PM

There are 2 drinks.
Drink A contains 40% alcohol.
Drink B contains 65% alcohol.
In what ratio should we mix to make it become a drink of 50% alcohol?

0.0
too深哦中幾的maths???

作者: 幻藍 時間: 22/10/2004 06:45 PM

sahklr 在 2004-10-22 06:44 PM 發表:

0.0
too深哦中幾的maths???

中三掛

作者: oscar 時間: 22/10/2004 06:52 PM
係呀...
都唔知點解個先生可以出到咁鬼難...

作者: 幻藍 時間: 22/10/2004 07:12 PM

oscar 在 2004-10-22 06:52 PM 發表:

係呀...
都唔知點解個先生可以出到咁鬼難...

上年個過同類的問題
好像是跟XX消元法有關的........

作者: 抹茶可樂 時間: 22/10/2004 08:17 PM

oscar 在 2004-10-22 06:31 PM 發表:

There are 2 drinks.
Drink A contains 40% alcohol.
Drink B contains 65% alcohol.
In what ratio should we mix to make it become a drink of 50% alcohol?

Let the ratio of Drink A and Drink B is m:n
Water contains in Drink A = 60%
Water contains in Drink B = 35%

40%m + 65%n = 60%m + 35%n
0.2m = 0.3n
m/n=3/2

The ratio of Drink A and Drink B is 3:2

就係咁啦喵～'w'

[ Last edited by 落雷 on 2004-10-22 at 08:18 PM ]

作者: oscar 時間: 22/10/2004 08:35 PM

落雷在 2004-10-22 20:17 發表:

Let the ratio of Drink A and Drink B is m:n
Water contains in Drink A = 60%
Water contains in Drink B = 35%

40%m + 65%n = 60%m + 35%n
0.2m = 0.3n
m/n=3/2

The ratio of Drink A and Drink B ...

...
咦...原來係咁容易ja...我仲諗到頭爆都未諗到...

作者: rogergeot 時間: 22/10/2004 08:44 PM
佩服，佩服。落雷，你真捧。這條數學難題再一次證明我揀文科是正確。
因為我只是set到 40%m (alcohol)+ 65%n (alcohol) =50% (alcohol)

作者: 莫邪 時間: 22/10/2004 11:38 PM
天殺的
太久沒接觸過
不懂了=="

作者: 幻藍 時間: 23/10/2004 08:59 AM
what is "天殺的"???

作者: 柳絮仙 時間: 23/10/2004 09:02 AM
我先P.6,這題MATHS唔識

作者: Harpuia 時間: 23/10/2004 01:40 PM
問題：
There are 2 drinks.
Drink A contains 40% alcohol.
Drink B contains 65% alcohol.
In what ratio should we mix to make it become a drink of 50% alcohol?

oh~~~my god雞腸數....................

作者: Apple798 時間: 22/7/2005 02:55 PM
我未學

作者: 耿鬼孔明 時間: 24/7/2005 11:40 PM
這題是中三考試常出的數(中二都有可能)分分鐘中五也會出的
所以呢d數要煲熟它(我就係呢題低分過人=.="唔抵)

作者: 抹茶可樂 時間: 27/7/2005 08:39 PM
大家呃夠了
鎖

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