I need to write these 4 expressions in factored form.

Which ratio is equivalent to 10: 85

How do you use the elimination method for this question? explain, because i really want to understand!

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.