Wow, even reading that description I have no idea what the picture was supposed to mean.
I guess that your system has two taps and two sensors. Each tap will be controlled by a servo. One sensor will be used to set the proportion of two liquid. The other sensor will be used to set the flow rate (or quantity - I'm not sure which) of the resulting mixture.
Is that the sort of thing you're trying to achieve?
By the way, you can't use % in a variable name. You could use the word percent (or some abbreviation) instead.