Mathematics
The maximum legal height of a flatbed tractor trailer in a certain state in the US is 13.5 feet above the ground. The floor of a certain trailer is 5 feet above the ground. The remaining height is for cargo. If the cargo on this trailer consists of c layers of wood, each 1.5 feet high, which of the following inequalities can be used to determine the number of layers of wood that can be in compliance with the law?
解析：