Question 254408
.34x+.04(100-x)=.07*100
.34x+4-.04x=7
.30x=7-4
.30x=3
x=3/.30
x=10 ml. of 34% solution is used.
100-10=90 ml. of 3% solution is used.
Proof:
.34*10+.04*90=7
3.4+3.6=7
7=7