1 over 3b = 4 over 5. which of the following equals b in this equation?

2 2 over 5

1 1 over 8

2 over 5

1 over 4

1 / (3b) = 4/5 multiply both sides by 5

5 / (3b) = 4 multiply both sides by 3b

5=12b divide both sides by 12

b=5/12 (not sure why you don't have that as an option in your answers, perhaps I misunderstood your description of the original equation ...)