A Snail On Top of The Wall !

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Read the question first! 

Let's find out progress of snail day by day.

Day 1 : UP to 10, DOWN to 4

Day 2 : UP to 14, DOWN to 8

Day 3 : UP to 18, DOWN to 12

Day 4 : UP to 22 which is greater than 20.

So snail requires 4 days to reach the top of the wall.



Number of days taken by snail to climb up the wall.
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