What you cannot hold but it is yours?

Can you replace the question mark with the correct number?

No matter how little or how much you use me, you change me every month. What am I?

An equation has been laid down using a few matchsticks. However, as you can see, the equation is not correct. Can you correct the equation if you are allowed to add or remove 5 matchsticks?

What can you deduce from the following BrainBat?

CRY
LMKI

Can you replace the question mark with the correct letter?

6 + 6 + 6 = N
7 + 7 + 7 = E
8 + 8 + 8 = R
0 + 0 + 0 = ?

What has a ring but no finger?

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?