A code compliant, medical gas storage room contains a large number of different compressed gases.

A code compliant, medical gas storage room contains a large number of different compressed gases. The gases are in 25 cu. ft. cylinders and in 250 cu. ft. cylinders. All cylinders are full. The Safety Officer completed a cylinder storage audit and discovered the room was over the maximum amount of compressed gas cylinders allowed by 140 cu. ft. Which of the following is the minimum number of 25 cu. ft. cylinders that must be removed to make the storage room code compliant?