Jerry is a judge. He hears 5 cases every 2/8 hours. Jerry hears cases at a constant rate

How many cases does he hear per hour?

Nine more than four times a number is the same as one less than twice the number. find the number?

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

Suppose 38 lbs of coffee beans are required to produce 2 lbs of farmer's coffee. how many lbs of coffee beans are required to produce 309 lbs of farmer's coffee?