Answer:
160 inches longer.
Step-by-step explanation:
Let x represent the length of the blue yarn.
We have been given that a piece of yellow yarn was 230 inches long. After 90 inches had been cut from it, the piece of yellow yarn was twice as long as a piece of blue yarn.
Twice the length of blue yarn would be
.
We can represent this information in an equation as:



Therefore, the length of blue yarn is 70 inches long.
Now, we will subtract 70 from 230 as:

Therefore, the yellow yarn was 160 inches longer than the blue yarn.