By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I have an eye but still cannot see.

Who am I?

Can you count the number of blocks in the picture below?

What is more useful when it is broken?

Count the Triangle in the figure given below:

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

On rolling two dices (six-sided normal dice) together, what is the probability that the first one comes up with a 2 and the second one comes up with a 5?

For an extra income, John decided to work at a Hotel for one hour daily. The manager offers him that they will pay him $11 after every 11 days.
However, John offered a different proposition to the manager. The offers stand as:
He will be paid just a penny on his first day.
Two pence will be paid on the second day,
Four pence will be paid on the third day.
And so on till the 11th day.

Should the Hotel manager accept his offer?