Brain+Teaser+Answers

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 * || The first son fenced in an area that is twice as large as that fenced in by the second son.
 * || The first son fenced in an area that is twice as large as that fenced in by the second son.

Where could you place exactly 10 X’s in the circle so that exactly 2 X’s are only in both the square and the circle, exactly 5 X’s are in the triangle, and exactly 5 X’s are in the square? Some X’s have to be only in the circle and not in the triangle or the square. ||
 * Place the X’s ||
 * || Take a good look at this figure.