A truck delivered n number of boxes weighing 20 pounds and t number of boxes weighing 30 pounds to a warehouse. The equation w = 20n + 30t can be used to determine the total weight w, in pounds, of the boxes. If the total weight of the boxes delivered was 480 pounds and 12 boxes weighed 30 pounds, how many boxes weighed 20 pounds?
Maps to Category 15 of the book.
Answer posted on 08/01/2021