Apiece 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. at first, how much longer was the yellow yarn than the blue yarn?

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.