Riddle: There are 10 fish in my fish tank. Suddenly, two of them drown, three of them swim away, and four of them die. How many fish are left in the tank?
Answer: There are still 10 fish left. For one thing, fish can't drown. Plus, none of the fish could have swam away because they're still in the tank.
Riddle: There are five doors in front of you in the following order: black, blue, black, black, blue. Only one door will lead you to freedom, and you only have one chance to pick it. Assuming that all three hints are true, can you pick the correct door? 1) The correct door is black. 2) The correct door is not next to the leftmost or the rightmost door. 3) The correct door is not in the middle.
Answer: The leftmost door is the correct door. There are only three black doors, so it's one of them (we can eliminate doors two and five because they are blue and not black). The fourth door should be eliminated next because it's next to the rightmost door, which contradicts the second hint (we can't eliminate the first door because it's not correct to say that the leftmost door is next to itself). And the middle door is a trap, too. Therefore, the first door is the best choice.
Riddle: A mad chef forces you to cook breakfast for him; if he likes it, he'll set you free, but if not, you'll stay with him forever. While you're at the stove cooking something up, the chef dumps an entire container of salt into the pot you're cooking with. But when you serve breakfast, the chef realizes he'll have to let you go. What did you cook for him?
Answer: You cooked some boiled eggs. No matter how much salt is added to the pot, the boiled eggs won't be salty.
Riddle: "I was walking to my local grocery store to pick up some stuff when I saw that my neighbor Rachel's house had been burgled! It was very cold outside, and I saw some frost on the window. I breathed on the glass to get rid of the frost, and I saw that Rachel's safe had been open and that her money was stolen!". That was Hank's story. An officer who was investigating asked Hank, "And where did you hide the money you stole from your neighbor?". How did the officer come to this conclusion?
Answer: Windows become frozen over from the inside, not the outside, so Hank couldn't have wiped off the frost from the window to find the money stolen.
Riddle: When summer break ended, Mila told her friends about her vacation in Africa. Mila said, "Oh, it was great! But on the last day of my trip, a massive volcanic eruption happened; it didn't spoil my vacation only because I flew home that day,". Mila's friends didn't believe her. Why?
Answer: All flights must get canceled when a volcanic eruption occurs, so Mila couldn't have flown home on the last day of her vacation; she's lying.