A 20x21 rectangular floor needs to be tiled using square tiles that are uncuttable, non-overlapping and having integer sides.

What is the smallest total number of tiles to make this possible?

(In reply to Possible spoiler by Harry)

Harry's solution joins 6x21 and 14x21 rectangles, each tiled with squares.

Posted by xdog on 2014-08-07 10:26:58