A tree is 20 meters tall. An ant is climbing it. Every day the ant climbs 5 meters, and each night it descends 4 meters. In how many days will the ant reach the top of the tree?
Answer 16
Each day he's only netting 1 meter, but after 15 days he's 15 meters high and then on the 16th day he reaches the top without sliding back down.
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