Frog in the Well Puzzle

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A frog is at the bottom of a well which is 20 meters deep. Everyday the frog jumps 5 meters upwards and fall 4 meters down.

How many days it will take for the frog to reach the top?

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First day it jumps 5 meters and falls 4 meters. Now the frog will be at a height of 1 meter.

Second day it jumps to 6 meters and falls back to 2 meter.

Third day it jumps to 7 meters and falls back to 3 meter.

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This is repeated for 14 days and on fifteenth day it jumps to 19 meters and falls back to 15 meters.

Finally, sixteenth day it jumps to 20 meters, but now the frog have reached the top of the well.

So the frog reaches the top of the well on the sixteenth day.

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