Write this ratio as a fraction in simplest form without any units. 20 quarts to 9 gallons

While on a train trip, marsha noticed that there were 35 people in her train car. after the next stop, there were only 21 people in her car. if p represents the percent decrease in the number of people in marsha's train car, what is p?

The average distance in miles traveled in one hour if 660 miles can be covered in 1.5 hours

What is the value of the rational expression below when x is equal to 4 x-12 over x-8