Question 298313
Your first equation is ok.
I would use 2/3 instead of .66

45s+35b=51750
45s/2+2/3*35b=30600 

We will want what is left  not what was sold
b = 810,   s = 520
This is the entire stock
We take 1/3 of the blouses and 1/2 of the skirts
810/3=B and 520/2=S
B=270 and S=260