The height of the pine is 20 m. A snail crawls along it, rising 2 meters every day and going down 1 meter every night. How many days will it take for a snail to climb to the top of a pine tree?
In the terms of the problem, it is said that the snail rises by 2 m per day and descends by 1 m during the night, which means the first action:
1.2 – 1 = 1m – this is how much a snail rises in a day.
In 18 days the snail will climb 18m.
2.18 x 1 = 18 m in 18 days.
And in another 1 days it will rise by 2m.
3.18 + 2 = 20 meters in 19 days.
Answer: 19 days.
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