The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

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?

What kind of tree can you carry in your hand?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

When can we add 2 to 11 and get 1 as the correct answer?

Find the combined weight of the Cat, Dog and Rabbit in the given picture.

Complete the given grid with valid words. You can only use the letters AAEEIIMMPPTT.

Hint: The grid reads the same across as down.

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Can you find a five letter word that is left with only two letters if one is removed?

James bond was pushed out of an aeroplane without any parachute.
He survived, How come?