It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

John needs to purchase 100 chocolates from three different shops and he has exactly 100 rupees to do that which he must spend entirely. He must buy at least 1 Chocolate from each shop.

The first shop is selling each chocolate at 5 paise, the second is selling at 1 rupee and the third is selling at 5 rupees.

How many chocolates should he buy from each shop?

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

What jumps when it walks and sits when it stands?

Buy me, smell me or deliver me, I do not change.

Who am I?

what does this below rebus represent identXQQQQQME

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?