So s stands for soy sauce and v stands for vinegar
150ml(s)=100ml(v)
150ml(s) / 150 ml(s)=100ml(v) / 150ml(s)
It will give you 2/3 (in decimal .67)
For the next one you divide the 100 on both sides
150ml(s) / 100ml(v)=100ml(v) / 100ml(v)
It will give you 1.5 or 1 1/2
