Mathematics, 31.07.2019 18:30 elianagilbert3p3hh63

Oliver works at a book store. he packed 20 identical paperbacks and 9 identical textbooks in a box .the total mass of the book was 44.4 pounds . after he put 1 more textbook and 5 more paperbacks in the box, the total mass of the books was 51 pounds.

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Oliver works at a book store. he packed 20 identical paperbacks and 9 identical textbooks in a box ....