Oli iver works at a bookstore. He packed 20 identical panerbacks and 9 identical textbooks in a box. The total mass of the books was 44.4 pounds. After he put I more textbook and 5 more paperbacks in the box, the total mass of the books was 51 pounds. Write a system of equations that can be used to determine p, the mass, in pounds, of one paperback, and t, the mass, in pounds, of one textbook.
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