Answer:
A man is climbing up a mountain.He has to travel 100 km to reach top of mountain. Every day He climbs up 2 km forward in day time.At night, while he is asleep, he slips down 1 km backward Then how many days does it take him to reach mountain top?
1st day height achieved 2km
1st night -1km
effective climb on beginning of day 2 is 1km
2nd day height achieved 3km
2nd night -1km
effective climb on beginning of day 3 is 2km
so on….
.
.
.
effective climb on beginning of day 98 is 97km
98th day height achieved 99km
98th night -1km
effective climb on beginning of day 99 is 98km
99th day height achieved is 100km