Grandpa's truck can hold 675 rolls of toilet paper. You think you will sell all of the toilet
paper at the remate. How much do you need to charge per roll to cover the cost of $1
per roll to grandpa, the gas in his truck, and the fee to the remate? (It is also easy.
Calculate y in the last equation, and divide by 675.)

The mountain springs water company has two departments, purifying and bottling. the bottling department received 67,000 liters from the purifying department. during the period, the bottling department completed 65,000 liters, including 3,000 liters of work in process at the beginning of the period. the ending work in process was 5,000 liters. how many liters were started and completed during the period?