Question 900616
0.4*x+0.18*50=0.3(50+x)
0.4*x+9=15+0.3x
0.4x-0.3x=15-9
0.1x=6
x=60 gallons of 40% alcohol solution
check
0.4*60+0.18*50=0.3(50+60)
24+9=0.3(110)
33=33
ok