What runs around the whole yard without moving?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

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?

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.

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

Find the value of "?" in the ball picture Riddle below:

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?