Question 211022
.12x+.20*6=.15(x+6)
.12x+1.2=.15x+.9
.12x-.15x=.9-1.2
-.03x=-.3
x=-.3/-.03
x=10 gallons of 12% salt is used.
Proof:
.12*10+.20*6=.15(10+6)
1.2+1.2=.15*16
2.4=2.4