Question 1128270
Ounces?  Assuming you really mean, fluid ounces, and assuming the percentages as v/v, then


x fluid ounces of the 60% alcohol


{{{60x=9*128}}}

{{{20x=3*128}}}

{{{x=19.2}}}--------fluid ounces of the 60% methanol

{{{108.8}}}  --------fluid oucnes of water