Question 151786
.75x+.50(1000-x)=.65*1000
.75x+500-.50x=650
.25x=650-500
.25x=150
x=150/.25
x=600 L of 65% additive.
1000-600=400 L of 50% additive.
Proof.
.75*600+.5*400=650
450+200=650
650=650