What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

Using Only Five 5's and any mathematical operator make sum as 37

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

There was a strange boy who was born before his father. How can this be possible?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

What makes this number unique: 8,549,176,320?

You visit a home for specially-abled children on the occasion of Christmas where you meet with 50 children. You have a box of chocolates containing 50 chocolates exactly.

What if you were asked to one chocolate to each child in a manner that one chocolate still remains in the box? Is it possible?