Posted by Helen on Saturday, September 24, 2011 at 2:35pm.
farmer has 10 trees see if you can plant them so there are 5 rows of trees with 4 trees in each row

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

Math  Steve, Monday, September 26, 2011 at 5:05am
Yes, 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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