Question 906507
a+b=1.55,
1.2*a+1.8*b=1.62*1.55
a=1.55-b
1.2*(1.55-b)+1.8*b=2.511
1.86-1.2b+1.8*b=2.511
0.6*b=0.651
b=1.085
a=1.55-b
a=0.465  lb. at $1.20
b=1.085  lb. at $1.80
check
1.2*0.465+1.8*1.085=1.62*1.55
0.558+1.953=2.511
2.511=2.511
ok