7. Find the total weight of the boxes of cheddar cheese in a shipment of 3 lb boxes of cheddar cheese and 2 lb boxes of Swiss cheese. (1) There were 20 fewer 2 lb boxes of Swiss cheese than 3 lb boxes of cheddar cheese. (2) The total weight of the shipment was 510 lb. As part of your solution, fill in the table below. Define any variables you use to solve the problem.


Cheddar Swiss Weight per box (lb) x Number of boxes = Total weight (lb) ​