Algebra
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 > 20x
solve
40x + 7(20x) = 404
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