It depends on the units used for measuring the tiles: 17x17 inches, centimetres etc. As you have not specified this we can not answer your question.
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350.
350 !
Plan on about 2.2 cubic yards (2.8 tons) of gravel.
It would depend on the precise layout of the room, and how well you can cut tiles if the room isn't some precise multiple of 1.5 feet. In general, a tile that is 18 inches square covers 1.5*1.5=2.25 square feet. Disregarding tile fragments, 350 / 2.25 = 155.5555 tiles.
350