How can a man go eight days without sleep?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

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?

By what process could you make a 'Tea-Table' into food?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

What can you serve, but never eat?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

I’m tall when I’m young, and I’m short when I’m old. What am I?