posted by Kate .
A moving Company weighs 20 boxes you have packed that contain either books or clothes and says the total weight is 404 pounds. You know that a box of books weighs 40 pounds and a box of clothes weighs 7 pounds. Find how many boxes of books and how many boxes of clothes you packed.
number of boxes of books ---> x
number of boxes of clothing ---> 20-x
40x + 7(20-x) = 404