Question 1101221
We have 6 lbs of 37% mix
We want to add some 22% mix  to make   32% mix
0.22*x+0.37*6=0.32(6+x)
0.22*x+2.22=1.92+0.32x
0.22x-0.32x=1.92-2.22
-0.1x=-0.3
x=3 lbs at 22% (0.66) is added to 6 lbs at 37%(2.22) to make 32% of 9 lbs(2.88)
check
0.22*3+0.37*6=0.32(6+3)
0.66+2.22=0.32(9)
2.88=2.88
ok