A new medical building containing 100 offices had just been completed. Mark was hired to paint the numbers 1 to 100 on the doors. How many times will Mark have to paint the number nine?
Answer: The answer is 20! 9, 19, 29, 39, 49, 59, 69, 79, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99.
Solution:
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Joe has ten coins totaling $1.19. From these coins, he cannot make exact change for a dollar, half-dollar, quarter, dime, or nickel. What are the coins?
Answer: A half-dollar, a quarter, four dimes, and four pennies.
Solution:
What build its house with earthen string and ensnares its prey with a biting sting?
Answer: spider
Solution:

Who Is Wearing A Hat ? – tricky Puzzle
Answer: Both Alex and Carl are wearing hats.
Solution:
Answer: Both Alex and Carl are wearing hats.
Reason:
As per given information we understand that, Bob is not wearing a Hat, Carl is wearing a hat.
Now if Alex doesn’t wear a Hat, than Bob must wear a Hat.
But he is not wearing a Hat. So it implies Alex is also wearing a Hat.
So Alex and Carl are wearing hats.
Answer: Both Alex and Carl are wearing hats.
Reason:
As per given information we understand that, Bob is not wearing a Hat, Carl is wearing a hat.
Now if Alex doesn’t wear a Hat, than Bob must wear a Hat.
But he is not wearing a Hat. So it implies Alex is also wearing a Hat.
So Alex and Carl are wearing hats.