How many words can a pen with half refill write?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?

What has to be broken before you can use it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M