A cookie factory uses 7/10 of a barrel of oatmeal in each batch of cookies. The factory used 3 1/2 barrels of oatmeal yesterday. How many batches of cookies did the factory make? Write your answer as a fraction or as a whole or mixed number.

This size running track is usually called a 400 meter track. however if a person ran as close to the inside as possible on the track they would run less than 400 meters in one lap. how far away from the inside border would someone have to run to make one lap equal exactly 400 meters