Question 363211
.18x+.13(50-x)=.17*50
.18x+6.5-.13x=8.5
.05x=8.5-6.5
.05x=2
x=2/.05
x=40 ml of 18% acid is used.
Proof:
.18*40+.13(50-40)=.17*50
7.2+.13*10=8.5
7.2+1.3=8.5
8.5=8.5