If we let p and t be the masses of the paper and textbook, respectively, the equations that would best represent the given in this item are: (1) 20p + 9t = 44.4 (2) (20 + 5)p + (9 + 1)t = 51
The values of p and t from the equation are 0.6 and 3.6, respectively. Thus, each paperback weighs 0.6 pounds and each textbook weighs 3.6 pounds.