You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Replace the question mark with the correct number in the below-given picture?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What has many teeth, but cannot bite?

Three men in a cafe order a meal the total cost of which is $15. They each contribute $5. The waiter takes the money to the chef who recognises the three as friends and asks the waiter to return $5 to the men.

The waiter is not only poor at mathematics but dishonest and instead of going to the trouble of splitting the $5 between the three he simply gives them $1 each and pockets the remaining $2 for himself.

Now, each of the men effectively paid $4, the total paid is therefore $12. Add the $2 in the waiters pocket and this comes to $14. Where has the other $1 gone from the original $15?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

A man dies of old age on his 25 birthday. How is this possible?

Can you find out the total number of triangles in the given figure?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

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.