What is the next number in this matchsticks series riddle?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

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?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

An old Woman left INR 33,333 to be divided equally among two fathers and two sons and each was to receive INR 11,111.
How was this possible?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

Which alphabet letter is a question?

What is the Surname of Barbie Doll?