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December 18, 2014

December 18, 2014

Posted by **Helen** on Saturday, September 24, 2011 at 2:35pm.

- Math -
**bobpursley**, Saturday, September 24, 2011 at 2:40pmAm I missing something? five rows of four trees each is 20 trees.

- Math -
**Steve**, Monday, September 26, 2011 at 5:05amYes, this is one of those little teasers where you have to think outside the box. Arrange the trees in a pentagram. There are 5 trees at the vertices, and 5 more where the diagonals intersect. So, draw the lines and you'll see you have 5 intersecting lines, each with 4 trees. Each tree is counted twice.

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