What will you call your mother's brother's brother-in-law?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?

My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?