How to explain the math in a simple way

In 2012, Choi Gap-bok escaped from prison by squeezing his body through the food slot at the bottom of his cell door. The slot measured 5.9 inches tall and 17.7 inches wide. Choi, a yoga practitioner, applied skin ointment to his body and slipped out while 3 prison guards were https://t.co/vurUzXo56R