I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

What is next number in the pattern below:

131 517 192 123 ?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

You along with your friend are standing in front of two houses. Each of those houses inhabits a family with two children.

Your friend tells you the below two facts:
1) On your left is a family that has a boy who likes accounts but the other child loves science.
2) On the right is a family with a seven-year-old boy and a newborn baby.

You ask him, "Does either of the family have a girl?"

To this, he replies, "I am not quite sure. But can you guess that? If you are right, I will give you $500."

Which family do you think is likely to have a girl?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

"That Restaurant always remains crowded. This is the reason why nobody goes there".

Can you find a flaw in this statement?