What is next number in the pattern below:

131 517 192 123 ?

A mathematics teacher took exams for his students. Out of the total students, 25% passed both the tests included in the exam. However, only 42% were able to clear the first test.

Can you find out the percentage of those students who passed the first test and also passed the second test?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

If you paint a brown house white it will become a white house. If the stoplight changes from red to green, then the light is green. So, if you throw a white shirt into the Red Sea, what will it become?

Where do fish keep their money?

It is always ahead of me yet I can never see it. What is it?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?