Question 906807
a+b=16,
0.6*a+0.2*b=0.5*16
a=16-b
0.6*(16-b)+0.2*b=8
9.6-0.6b+0.2*b=8
-0.4*b=-1.6
b=4
a=16-b
a=12  liter at 60%
b=4  liter at 20%
check
0.6*12+0.2*4=0.5*16
7.2+0.8=8
8=8
ok