What always comes into a house through the keyhole?

What has to be broken before you can use it?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

A 3 digit number is such that it's unit digit is equal to the product of the other two digits which are prime. Also, the difference between it's reverse and itself is 396.

What is the sum of the three digits?

If 21x = 79x, what is the value of x?

During an experiment, a guy throws a bouncy ball from a 100 feet tall building. The ball has a specific characteristic. Every time it hits the ground, it bounces up halfway.

How many bounces do you think the ball will make before it comes to a stop ?

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.

There is something which is always coming but never arrives?

You can see it everyday, But cannot touch it at will. What is it?

Solve the alphametic puzzle by replacing the alphabet with the number.

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