美國 數學題: (聯立方程式)

gem1216

Question:
Steve is 24 years older than his sister Carol.
In 10 years, he will be twice as old as Carol.
How old is each of them now?

Solution:
steve is X years old.
carol is Y years old.


Steve is 24 years older than his sister Carol.
X = 24 + Y

In 10 years, he will be twice as old as Carol.
X + 10 = 2 (Y +10)

X = 24 + Y
X + 10 = 2 (Y +10)

X -  Y =  24
X + 10 =  2Y + 20

X -  Y =  24   .....(A)
X - 2Y =  10   .....(B)


(A) - (B)
Y = 14

X - 14 = 24
X = 38

X = 38
Y = 14

Steve is 38 years old.
Carol is 14 years old.

rex560810

i am  really impressed
the pigoo will be worldwide
but
why
did u post an American problem?:sam10

conbawa

回復 2# rex560810

For training our English ability?n_128|

逃兵

please use MathLab to sol it.

yoyomay

This is a book......
完了，英文只記得這幾個字......n_096|

poolking

回復 5# yoyomay


Your answer are best...

lujou

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carlos_liu

這題感覺並不會很難,難的是得先把它正確的翻成中文
Steve和Carol相差24歳,十年後,他們將相差一倍,請問現兩人各是幾歳?
承GOOGLE的翻譯能力,現在這題目是不是親切多了

gem1216

其實我的疑問是
哥哥38歲
妹妹14歲

哇! 那媽媽依常情不就是60歲左右
爸爸不就是約60到70歲

而且媽媽46歲以上才生妹妹,好辛苦,
哥哥的年紀都可以當妹妹的爸爸了
真實人生有可能發生嗎??

gi0001tw

#1，這到底是在考英文程度還是數學能力？把我給考倒了！

#9，哥哥38歲妹妹14歲這在美國離婚又結婚的很多，應該會常常發生。