Kraus Steel Company has two departments, Casting and Rolling. In the Rolling Department, ingots from the Casting Department are rolled into steel sheet. The Rolling Department received 31,600 tons from the Casting Department in October. During October, the Rolling Department completed 45,900 tons, including 15,900 tons of work in process on October 1. The ending work in process inventory on October 31 was 1,600 tons. How many tons were started and completed during October?