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seen Mar 28 at 22:41

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
Oct
3
revised How do you find the center of a circle with a pencil and a book?
added 83 characters in body