Count the number of triangles in the picture below:

What always comes into a house through the keyhole?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

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

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

A boy and a girl are sitting on the porch.
"I'm a boy," says the child with black hair.
"I'm a girl," says the child with red hair.
If at least one of them is lying, who is which?

Can you replace the question mark with the correct number in the below table sequence?