NIMCET 2018 Question Paper with solutions

A caterpillar crawls up 5 inches each day and slides down 4 inches each night.
∴ In 1 day it crawls up 1 inch.
Hence, in 70 days it crawls up 70 inches.
At the end of 71 days it will crawl up 5 inches again.
Hence, at the end of 71 days it will reach the top of the pole.