Luis
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 Oct 2 awarded Yearling Oct 2 awarded Yearling Oct 4 accepted Mystery card probability riddle Oct 4 answered Simple Logical reasoning question Oct 3 awarded Good Answer Oct 3 awarded Mortarboard Oct 3 revised How do you find the center of a circle with a pencil and a book? deleted 2 characters in body Oct 3 comment Mystery card probability riddle You are right, but I was looking for an answer that most people could easly understand. I've tried to explaint the solution using different approachs (including the ones in the post you refer) but most people struggle to accept it. Oct 3 revised Mystery card probability riddle edited title Oct 3 asked Mystery card probability riddle Oct 3 awarded Nice Answer Oct 3 comment How old are they? The way to get there is x-20 = y and x = 2 * (y-20) Oct 3 awarded Scholar Oct 3 awarded Supporter Oct 3 accepted How old are they? Oct 3 awarded Student Oct 3 asked How old are they? Oct 3 comment How do you find the center of a circle with a pencil and a book? And by the way, it works dosen't matter the size of the book or the circle. Oct 3 comment How do you find the center of a circle with a pencil and a book? I added an image to explain. The green line is a diameter because is perpendicular to the parallel lines (in red) and is crossing them at equal distance from both outer segments (in blue). Oct 3 awarded Editor