Question 159103
.11x+.125*10=.12(10+x)
.11x+1.25=1.2+.12x
.11x-.12x=1.2-1.25
-.01x=-.05
x=-.05/-.01
x=5 bags of 12% is used.
Proof:
.11*5+.125*10=.12(10+5)
.55+1.25=.12*15
1.8=1.8