Why do people go to bed?

If I put in one bird per cage, I have one bird too many. If I put in two bird per cage, I have one cage too many. How many cages and birds do I have?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

You bought me for dinner but never eat me. What am I?

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

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

What has hands, but can’t clap?

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

What Am I?

10+10 and 11+11 can give you the same answer.

Explain how?

I am Huge on Sunday and Saturday.
I am small from Tuesday to Thursday.
I do not exist on Monday and Friday.
Who am I?