A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Next Number in the Series,

5, 16, 49, 104, ?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Can you count the number of blocks in the picture below?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

I am sure no one can have two things for dinner. what are they?

The more you take me, the more you leave me behind.
Who Am I?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

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?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?