Question 311090
.07X+.03(75-X)=.04*75
.07X+2.25-.03X=3
.04X=3-2.25
.04X=.75
X=.75/.04
X=18.75 ml. OF 7% SOLUTION.
75-18.75=56.25 ml. OF 3% SOLUTION.
PROOF:
.07*18.75+.03*56.25=.04*75
1.3125+16.875=3
3=3