Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

I travel all around the world but always stay in the corner. What am I?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What does this rebus puzzle means ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

When it is alive we sing, when it is dead we clap our hands. What is it?

What can you hold in your right hand, but never in your left hand?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?