Do You See It?

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

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

Who has married many women but was never married?

Katniss and Peeta are liars. They both lie on some specific days.

Katniss lies on Fridays, Saturdays and Sundays. She speaks the truth on all other days.

Peeta lies on Tuesdays, Wednesdays and Thursdays. He speaks the truth on all other days.

Can you tell that one day of the week when both of them will say "Tomorrow, I will lie."?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

Why is the Hole below a Lock?

Can you fill the blank with the correct number?

6 30 870 756030 _____

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?