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10 trees (Posted on 2002-04-21) Difficulty: 2 of 5
You are working for a farmer, who gives you ten trees to plant. He tells you:

"I want you to plant these ten trees in five rows. There must be exactly four trees in each row. "

How do you plant the trees?

See The Solution Submitted by moochie    
Rating: 3.8750 (8 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
Solution | Comment 1 of 11
You'd probably need a piece of paper and a pencil for this...

a) Draw a line.
b) Draw another line that would cross line # 1.
c) Draw a third line that would cross both lines #1 and #2.
d) Draw a fourth line that would cross lines #1, #2 and #3.
(Now, you'll see that each line has three intersection points on it)
e) Draw a fifth line that will cross lines 1, 2, 3, 4 -- it's really not hard, just extend the original four lines a bit.

Now, each line will have four intersection points from cross-overs with other lines.

Now count all intersection points -- there are ten of them. That's where you will plant your trees.

Thus we have -- 10 points (trees) along five lines(rows). Each row has four trees on it. Voila.
  Posted by yasha on 2002-04-23 06:31:13
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