You are a lumber jack. You are chopping down a tree that is 91 cm thick. Every time you pull the you cut through 2 cm of the

Question

You are a lumber jack. You are chopping down a tree that is 91 cm thick. Every time you pull the
you cut through 2 cm of the tree. If 24 cm of the tree were already cut through when you started, how many pulls of the saw would be necessary for you to completely cut the tree down?

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