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Sept. 20, 2006
Tree Growth
Robin marked a large tree with an iron spike, hammering it into the wood 6 feet above ground level. If the tree grows 3 inches taller each year, how much higher would the nail be when he comes back 12 years later?
Adapted from Visual Brainstorms, a brainteaser game from ThinkFun (www.thinkfun.com).
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How do trees grow?
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The iron spike would still be 6 feet above the ground. Trees grow at their tops, not from their bases.
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