放眼看世界

現在，媽媽年齡比兒子大21歲
Now, Mom's age is older 21 years than her son's age

六年後，媽媽的年齡會是兒子的5倍 
After 6 years, Mom's age would be 5 times her son's age

請問：爸爸現在在哪？
Question：where is the Dad now？

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

STOP Moving Down！

嘿嘿~我知道你一定懶的算 想迫不及待想看答案 對吧！
I know U must can't wait to find out the answer, right！

不過不過~ 看答案前 還是希望你先算出 小孩年齡
But, really hope U figure out the son's age first before see the answer

然後認真思考 ~ 爸爸現在在哪？ 很有意思的數學題目~ trust me
and than, according to son's age to think about where's the Dad is
It's really a interesting math question. Trust me！

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

、、

、、、、

、、、、、、

、、、、、、、、

、、、、、、、、、、

、、、、、、、、、、、、

Answer is ：

設X為母親年齡，Y為小孩年齡
X = Mom's age，Y = son's age

X=Y+21
X+6=(Y+6)x5

得小孩年齡 got ~  Y = -3/4(years / 年) = - 9 mounths / 個月

意思是說 小孩9個月後才會出生
Means ~ Son will be born only 9 months later

根據懷胎10月等於差不多是9個月左右來推估

懷孕週期為最後一次的月經第一天加上九個月零七天為預產期

一般人認為一個月30到31天為一個月...

但事實上.懷孕一個月是以28天來計算.也就是4週算一個月

所以十月懷胎...差不多是9個月左右

According to pregnant period is about 9 months
Not 10 month  
because a month of pregnancy is counted by 28 days
equal to 9 months by the month we count normally (a month is 30-31days)

所以. . . . . . . . . . . . . .   極有可能. . . . . 
so................................ It's likely to mean...............

爸爸現在 正在媽媽的上面  XD
Dad is up the Mom's body..... haha : P

= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = =

發覺 這數學題還真有意思
This is a interesting Question, isn't it ！

不僅是單純的XY數學題~還要有懷孕週期的概念才回答的出來勒!
U have to know the concept of pregnancy period than be able to get the answer！