Find the next number in the sequence

5 12 24 36 ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A wealthy man lives alone in a small cottage. Being partially handicapped he had everything delivered to his cottage. The mailman was delivering a letter one Thursday when he noticed that the front door was ajar. Through the opening he could see the man's body lying in a pool of dried blood. When a police officer arrived he surveyed the scene. On the porch were two bottles of warm milk, Monday's newspaper, a catalog, flyers, and unopened mail. The police officer suspects it was foul play. Who does he suspect and why?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

By what process could you make a 'Tea-Table' into food?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

What has one eye, but can’t see?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

A father's child, a mother's child, yet no one's son.

Who am I?