What has no start, end, or centre?

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

What Am I?

Find out the missing number in the picture attached:

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

Complete the series by replacing "?" with the correct number.

ST ND RD TH '?'

Usually, a boxing match consists of twelve rounds. In a particular friendly match between two heavyweights, the match was finished in the ninth round itself as one of the boxers knocked out the other one.

But, in that fight, no man threw even a single punch.

How can this be possible?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

A quarter is one-fourth of a dollar but Mr. John has changed the equation as below :

DOLLAR * 4 = QUARTER

Can you replace each letter with a digit to make the above solution correct?