方程?明天要呀

設他現在的年齡是 y

16 + y = 2( y - 12 )
16 + y = 2y - 24
y = 40

所以, 啟業現在的年齡是 40歲

Let x be the age of Kai Yip now.

2(x - 12) = x + 16
2x - 24 = x +16
2x - x = 16 + 24
x = 40

設啟業現年ｙ歲．

ｙ＋１６＝２（ｙ＋１６－１２）

ｙ＋１６＝２ｙ＋３２－２４
ｙ＝１６－３２＋２４
ｙ＝８

所以他現在的年齡是８歲

設A 為啟業現在的年齡
16+A = 2 ( A -12)
A = 40

設啟業而家X歲...
(X+16)=2(X-12)
X=40

Let x be the age of Kai Yip now.

Then,
x + 16 = 2(x - 12)
x + 16 = 2x - 24
x = 40