Question 907576
.45*8+.33*12=20x
3.60+3.96=20x
7.56=20x
x=7.56/20
x=.378
x=37.8%

a+b=20,
0.33*a+0.45*b=0.378*20
a=20-b
0.33*(20-b)+0.45*b=7.56
6.6-0.33b+0.45*b=7.56
0.12*b=0.96
b=8.0
a=20-b
a=12.0  qt. at 33%
b=8.0  qt. at 45%
check
0.33*12.0+0.45*8.0=0.378*20
3.96+3.6=7.56
7.56=7.56
ok