self Maths Puzzle

You are planning to lay square tiles on an entire 1323cm by 3087cm rectangular floor without cutting or overlapping any tiles. If all the tiles must be the same size, what is the least possible number of tiles you could use?

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self Other Question

What is the smallest possible positive integer x>5, that leaves a remainder of 5 whenever it is divided by 10, 8 or 85? What is term number 19 in the following progression:
1,0,1,0,1,...?