How many words can a pen with half refill write?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

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

How Come ??

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

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

Solve the puzzle by telling what does below picture means.

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?