Rewriting the question, the given lengths that were cut from the board were 30 3/4 inches, 12 1/4 inches, and 16 1/4 inches. To obtain the remaining length of the board, all of the measurements cut are to be added and subtracted from 72 inches. This is shown below:
According to the problem the payment Sal did correspond to (2 rent + 1200)/3 = 1000 2 rent + 1200 = 3000 2 rent = 1800 rent = 900 this means that rent = $900