How many words can a pen with half refill write?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

How is the moon similar to a dollar?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

I am the first thing you need while camping.
I am always with the person named Marcos Valencia and Carrick.
But Pogba Zlatan and Rooney think I am wasteful and do not need me.
I am the second to the last thing to add when you are making a patch.

What am I?

Count the number of triangles in the below picture?

How is a fly different from a mosquito?