How do you make the number 7 an even number without addition, subtraction, multiplication, or division?
Drop the "S".
See also best riddles or new riddles.cleanlogicshort
What is as light as a feather but impossible to hold for several minutes?
This old one runs forever, but never moves at all. He has not lungs nor throat, but still a mighty roaring call. What is it?
A waterfall.cleanlogicwhat am I
I’m teary-eyed but never cry,
silver-tongued, but never lie.
double-winged, but never fly,
air-cooled, but never dry.
What am I?
Mercury. The element looks shiny, silver, and is wet. The god Mercury has two wings but only uses them to run.cleanshort
I look flat, but I am deep,
Hidden realms I shelter.
Lives I take, but food I offer.
At times I am beautiful.
I can be calm, angry and turbulent.
I have no heart, but offer pleasure as well as death.
No man can own me, yet I encompass what all men must have.
What did the beach say when the tide came in?
Long time no sea.cleanfunnyshort
What do sea monsters eat?
Fish and ships.cleanlogic
You have two lengths of rope. Each rope has the property that if you light it on fire at one end, it will take exactly 60 minutes to burn to the other end. Note that the ropes will not burn at a consistent speed the entire time (for example, it's possible that the first 90% of a rope will burn in 1 minute, and the last 10% will take the additional 59 minutes to burn).
Given these two ropes and a matchbook, can you find a way to measure out exactly 45 minutes?
The key observation here is that if you light a rope from both ends at the same time, it will burn in 1/2 the time it would have burned in if you had lit it on just one end.
Using this insight, you would light both ends of one rope, and one end of the other rope, all at the same time. The rope you lit at both ends will finish burning in 30 minutes. Once this happens, light the second end of the second rope. It will burn for another 15 minutes (since it would have burned for 30 more minutes without lighting the second end), completing the 45 minutes.logicmath
You have been given the task of transporting 3,000 apples 1,000 miles from Appleland to Bananaville. Your truck can carry 1,000 apples at a time. Every time you travel a mile towards Bananaville you must pay a tax of 1 apple but you pay nothing when going in the other direction (towards Appleland). What is highest number of apples you can get to Bananaville?
Step one: First you want to make 3 trips of 1,000 apples 333 miles. You will be left with 2,001 apples and 667 miles to go.
Step two: Next you want to take 2 trips of 1,000 apples 500 miles. You will be left with 1,000 apples and 167 miles to go (you have to leave an apple behind).
Step three: Finally, you travel the last 167 miles with one load of 1,000 apples and are left with 833 apples in Bananaville.cleanshort
Until I am measured I am not known. Yet how you miss me when I have flown.
How do birds communicate?