Why is Saturday stronger than Monday?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I throw two dice simultaneously.

What is the probability of getting a sum as 9 of the two numbers shown?

What does this rebus means ?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

What country can make you shiver?

What is common among 11, 69, and 88?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

Be active and find the killer in the picture Riddle below.