A jar contains red, white, and yellow candy pieces in the ratio of 9:5:4, respectively. When 7 pieces of red candy and 5 pieces of white candy are removed from the jar and 3 pieces of yellow candy are added, the ratio of red to white to yellow becomes 4:2:3. If the jar contains only these three colors of candy, how many pieces were originally in the jar?

Little's law can be applied to any part of the store, such as a particular department or the checkout lines. the store owner determines that, during business hours, approximately 84 shoppers per hour make a purchase and each of these shoppers spend an average of 5 minutes in the checkout line. at any time during business hours, about how many shoppers, on average, are waiting in the checkout line to make a purchase at the good deals store?