Snail decided to climb a tree whose height is 15 meters Every day she went up to 5 m, but every night, during sleep, went down to 4 meters. Through how much days after the beginning of his journey, she will reach the top of the tree?
You can immediately assume that the vertices of the tree snail reaches over 15 days. However, this answer is incorrect. The snail will zapolnit on the top of the tree after 10 days and 1 day, or ten and a half days. During the first 10 days after the beginning of his journey, she will rise to 10 m, 1 m per day. Within the next one day she will overcome another 5 m, i.e. reaches the top of the tree.