Question 327775
.80x+.30(800-x)=.60*800
.80x+240-.30x=480
.50x=480-240
.50x=240
x=240/.5
x=480 ml of 80% solution is used.
800-480=320 ml of 30% solution is used.
Proof:
.80*480+.30*320=.60*800
384+96=480
480=480