Question

A monkey climbs 90 cm up a slippery pole every
second and slips down 60 cm over the next second.
How many seconds will the monkey take to reach a
banana tied 450 cm up the slippery pole?
(Hint: Once the monkey reaches the banana, it will
not mind eating it even as it slips down!)
Please Explain It
I Know the answer is 25 but How the answer came??
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Answer 1

Answer:

hope above picture help