Ethan wants to buy an action figure for $3 and several packs of trading cards for $6 each at a toy store. he can spend no more than $39 at the store today, but if he spends $15 or more he will receive a free poster. write and solve an inequality where x represents how many packs of cards ethan can buy today to receive the free poster.

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?