Find the missing length indicated ​

What is a possible solutions of the x> 3?

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

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.