Answer: You should pass the buoy by the left side
Step-by-step explanation:
A combination of a green light and the number 5 signify the left side of the boat or the port side as the boat goes upstream. These buoys, lighted or not indicate safety procedures to be followed or provide boaters with some information about the area they are. They can restrict movement, designate an area as a swimming area or indicate how to pass the signs, much like road signs.