More heads are better than one...
To freakbuses' quiz, I find it puzzling to solve.
My views:
Hint 4: Used to be either SMRT/SBST , now change over
Hint 5: Serangoon Rd or some construction site
Hint 6: Most confusing.. Based on the hint 6, eg 139= 1+3+9=13,
which is the first portion of 139.
If apply this formula, only got the following possibility: Sv
2,3,6,7,8,9,10,30,40,60,70,80,90,100,119,139,159,169,179,189,199,200,300,400,800,900
Only sv 189,300 was transferred from SBST to SMRT.If want, sv 179
too.
I have no idea....