Question 167199
9x+6(100-x)=7.65*100
9x+600-6x=765
3x=765-600
3x=165
x=165/3
x=55 liter of $9 cemicals are used.
100-55=45 liters of $6 chemicals are used.
Proof:
9*55+6*45=765
495+270=765
765=765