Can you find out which number multiplied by itself will give the output as 12345678987654321?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

What is the fastest way to double your money?

On a bright sunny day, two fathers took their son fishing in the lake. Each man and son were able to catch one fish. When they returned to their camp, there were only three fishes in the basket. What happened?

PS: None of the fish were eaten, lost, or thrown back.

What word is pronounced the same if you take away four of its five letters?

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

Can you identify the famous TV character from the rebus below?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?