Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

How can you make a TV, a bed, a dog, and a car liquid?

A woman named Maria was at the funeral of her mother. She met a nice young man that she had never seen before and after the service, they spent a bit of time together. Then she got busy and didn’t get his name or phone number before he left. She tried to find him, but no one knew who he was or how to contact him. A few weeks later, Maria’s older sister dies and the police suspect murder. Who killed the sister?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

My thunder comes before lightning.
My lightning comes before my rain.
My rain dries up all the land it touches.

Who am I?