Solution:

A quill cannot write even a single word. However the person holding the quill can use it to write as many words possible with the given amount of ink.

Solution:

prinka is 10, in a system that awards five for each vowel.

Solution:

Since the knife was in her hand which implies that she was planning to kill her husband "Inspector Montalbano".

Solution:

The clerk said that every day the password is CHANGED. Changed is the password.

Solution:

Hhe hung herself using big Ice slabs , which are now now melted and hence puddle of water.

Solution:

Hockey Stick $49.50 & ball $0.50

Solution:

fIvE thOUsAnd(5000)

Solution:

On the back, since bullet train is accelerating, therefore,the person at the back will spend less time than one in front.

Solution:

There are 3 fruits (1 grapes, 1 apples, and 1 oranges).

Solution:

The matchsticks that are marked with red are to be removed and the final figure will have just two squares. You can remove either pair from the possible four ways.

Solution:

There is no mention if you can use sign or not and thus the only possible way to get this is as follows:

(15 - 9) + (13 - 7) + (7 - 1) + (9 - 1) + (13 - 9)

If you solve inside the brackets, you will get the following equation
6 + 6 + 6 + 8 + 4
Adding all these numbers, you will get 30 which is the required sum.