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

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?

Find the missing letter in the last circle logically in the given below picture.

I have Rs.50 and I spend it in the way as below.

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

You can move only two matchsticks in the given picture. What is the highest number you can form by doing it?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?