B x (300-250)=550 45:5xb=900

Question

B x (300-250)=550
45:5xb=900

Answer 1

B * (300-250) = 550
b * 50 = 550
b = 550 : 50
b = 11

45:5*b = 900
9b = 900
b = 900 : 9
b = 100