Answer:
(B-P) / Pz = r
Step-by-step explanation:
B = P + Prz
Subtract P from each side
B-P = P -PPrz
B-P = Prz
Divide each side by Pz
(B-P) / Pr = Prz/Pz
to be honest I agree that would be 6s
11/20
simplify 22/40
You cross multiply to solve for a variable. You cross multiply when given a proportion.