What Time Should the last watch show in the below figure?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

Can you find the thief by just looking at the picture below?

I have a clock(12-hour format) and both the needles of the clock overlap at 12:00.
After how much time, they will overlap again?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Can you name four days which start with the letter 'T'?

Look at the picture and find out which square is not linked with any of the other squares.