Monkey

Monkey fell in 40 meters deep well. Every day it climbs 3 meters, at night it dropped back by 2 m. On what day it gets out from the well?

Result

n =  38

Solution:

3n2(n1)=40 n=40332+1=383n-2(n-1)=40 \ \\ n = \dfrac{ 40-3}{3-2}+1 = 38



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