If you say my name, I will no longer exist. What am I?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

John bought 150 chocolates but he misplaced some of them. His Father asked him how many chocolates were misplaced.
He gave the following answer to him:
If you count in pairs, one remains
If you count in threes, two remain
If you count in fours, three remain
If you count in fives, four remain
If you count in sixes, five remain
If you count in sevens, no chocolate remains.

Can you analyze the statements and tell us how many chocolates were lost?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

What can you hold in your right hand, but never in your left hand?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _

Can you write down eight eights so that they add up to one thousand?

What brings you down but never up?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.