When it's bad luck to meet a black cat?

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?

If an electric train is travelling south, then which way is the smoke going?

Find the next number in the series.
1 10 24 43 67 ?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

What does this rebus means ?

PROG WORKRESS

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

If six children and two dogs were under an umbrella, how come none of them got wet?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?

What's the best place to go shopping in the ocean?