John worked 35 hours a week at buy-the-best for $8.50 per hour. so far, he has earned $3,272.50. how many weeks has john worked at buy-the-best?

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.