What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

How many words can a pen with half refill write?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

If a shopkeeper can only place the weights on one side of the common balance. For example, if he has weights 1 and 3 then he can measure 1, 3 and 4 only. Now the question is how many minimum weights and names of the weights you will need to measure all weights from 1 to 1000? This is a fairly simple problem and very easy to prove also.

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Can you find out the number that should replace the question mark with a valid reason?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?