Which number should replace the question mark?

How many times can you subtract the number two from the number fifty?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

Be active and find the killer in the picture Riddle below.

I know a nine-letter word having only one vowel.
Do you ?

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?