Replace the question mark with the correct number.

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Can you find out the missing number in the grid?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Which is Odd One Out and why?

4377

3954

9862

8454

9831

What brings you down but never up?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

Eight of us go fourth, not back, to protect our king from an attack. What are we?