Riddles, brain teasers, math problems, brain busters — we’re covering them ALL today!

As a full-time writer at BuzzFeed, I cover travel, books, relationships, sitcoms, and all things pop culture.

Answer: 5¢. When the ball costs 5¢, the bat costs $1 more, so it costs $1.05. So... $1.05 + $0.05 = $1.10. 

Answer: The letter "n." If you remove the letter "n" from the word wiNdow, you get widow (a grieving wife). If you add the letter "n" to the word door (to make doNor), it represents a donor (someone giving life).

Answer: The two coins are a quarter and a nickel. The quarter is the "one coin" that isn't a nickel.

Answer: The letters from "new door" can be rearranged to spell "one word." 

Answer: "What would the other guard tell me if I asked which door led to heaven?" Then you take the other door. The truth-teller will truthfully tell you that the liar will lie and pick the door to hell. The liar will lie and say the truth-teller will pick the door to hell.

Answer: They are father and son. The phrase "my father's son" essentially means "me." So the father of the two is saying, "This man's father is me," or "This is my son." 

Answer: `All 12 months have 28 days. Not *exactly* 28 days. But they all have 28 days (and then some). 

Answer: One. The man was heading to St. Ives alone. He had seven wives, but they were not with him. 

Answer: Halfway. After that, the dog is running out of the woods, not in.

Answer: It was a plane crash. They were found in the cabin of the crashed plane. 

 Answer: Beauty...because it's in the eye of the bee-holder. 

Answer: They weigh the same, as they are both 1kg.

Answer: None, or else it wouldn't be a hole. 

Note: Some responses have been edited for length and/or clarity.

Note: Some responses have been edited for length and/or clarity.