18. 
An underground chamber has been discovered in an old mansion. The chamber is thought to have been used for storing ammunition. The dimensions of the chamber are 13 feet by 9 feet by 9 feet. An old ammunition crate was also found in the chamber and it had dimensions of 1 foot by 1 foot by 3 feet. What is the maximum number of ammunition boxes of that size that could be put in the underground chamber?


19. 
Captain Howard had his crew paint the smokestack on his ship the Sea Snail. The smokestack is shaped like a cylinder and is 35 feet 3 inches tall. The radius of the smokestack's base is eight feet. What is the surface area of the smokestack?

