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?

What can go up a chimney down, but can’t go down a chimney up?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Remove two matchsticks to make the below equation correct.

An apple seller is hosting a competition. He offers 1000 apples and 10 boxes to the people who pass by. The challenge is to put those 1000 apples in the 10 boxes in such a manner that if he asks for any amount of apples, the person can directly give him the boxes or a combination of boxes. If the person can do it, he promises to give a thousand apples for free.

If you happen to pass by the apple seller, will you be able to win a thousand apples?

I have branches, but no fruit, trunk or leaves. What am I?

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?