9.

Given that 4:5:8 is equivalent to 1:n:b. Find the ratio of n:b only.

Step-by-step explanation:

So 4:5:8

= 1:n:b

which means that 4/n = 1

n = 1x4 so n=4

Now we know that 4 is divided by 4 to get 1, so we do the same for the other two values.

5/4 = 1.25 and 8/4 = 2

So now place the values for n:b

n = 1.25 b=2

So n:b = 1.25:2

To check, multiply each of the values in 1:1.25:2 by 4 and see if the answer you get is the same as 4:5:8.