This is a simple one. You just have to count the number of Fs in the given sentence.

Finished Files are the result of years of scientific study combined with the experience of years.

How many did you count?

How can you take 2 from 5 and leave 4?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

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

How Come ??

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Find the smallest sentence with all the English alphabet.

Who is that with a neck and no head, two arms and no hands? What is it?