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

which number am I?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

What is next number in the pattern below:

131 517 192 123 ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Five teams were competing in cricket where they faced each other exactly once. After the tournament, the following is the point table.

DareDevils 6
SuperKings 5
Royals 4
Sunrisers 2
Riders ?

How many points did Riders end up with?

What does this rebus riddle mean?

When 99 is considered higher than 100?

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?