What runs around the whole yard without moving?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

Can you start the fire using two pieces of wood?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

What word does this rebus represent?

meta meta
meta meta

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

Using eight eights and addition only, can you make 1000?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?