Whats shows thr GFC of 18 and 24 with 18/24?

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

If you could answer these your a life saver

Askateboard ramp is in the shape of a right triangle what is the height of the ramp