If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

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

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

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

The more you take me, the more you leave me behind.
Who Am I?

what one word does the below rebus identifies?

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

What does this rebus means ?

One of the leprechaun is missing if you see the two pictures attached to this question. Where did he go? When he comes back, do you know where has he been?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?