What are seven layers of networking?

Problem statement:
What are seven layers of networking?

How can you cut a rectangular cake in 8 symmetric pieces in three cuts?

Problem statement:
How can you cut a rectangular cake in 8 symmetric pieces in three cuts?

In a dark room,there is a box of 18 white and 5 black gloves. You are allowed to pick one and then you are allowed to keep it and check it outside. How many turns do you need to take in order for you to find a perfect pair?

Problem statement:
In a dark room,there is a box of 18 white and 5 black gloves. You are allowed to pick one and then you are allowed to keep it and check it outside. How many turns do you need to take in order for you to find a perfect pair?

Coconut & sacks(bag) puzzles !!

Problem statement:
An intelligent trader travels from 1 place to another carrying
3 sacks having 30 coconuts each. No sack can hold more
than 30 coconuts. On the way he passes through 30 checkpoints
and on each checkpoint he has to give 1 coconut for each sack he is carrying.
Maximum how many coconuts he can save when he reaches last check point ?

Ans: He will be left with 25 coconuts in 1 sack

1. First 10 checkpoints = 30 coconuts. Thus, finishing his first sack.
2. Next 15 checkpoints = 30 coconuts. Thus, finishing his second sack.
3. Last 5 checkpoints = 5 coconuts. Thus, he still has 25 coconuts in his last sack