Question 906634
a+b=400,
0.3*a+0.9*b=0.54*400
a=400-b
0.3*(400-b)+0.9*b=216
120-0.3b+0.9*b=216
0.6*b=96
b=160
a=400-b
a=240  liter at 30%
b=160  liter at 90%
check
0.3*240+0.9*160=0.54*400
72+144=216
216=216
ok