Maths Question !!!

心算 z = 15

z : (z+3) = 5 : 6
z / (z+3) = 5 / 6
6z - 5z = 15

2008-04-02 15:26:49 補充：
because you should try to calculate yourself, no fun to only copy answer!

2008-04-02 15:30:54 補充：
And do you need anyone to tell you 6z - 5z is 1z and how z / (x+3) = 5 / 6 become 6z - 5z = 15?

候選編號 001 and 候選編號 002 also not good

你有冇漏咁d題目內容冇打落去呢?
唔係咁明bor...

得一條式
點求value??