A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

How can you make number one disappear by adding something to it?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

My location can be determined by the below rebus.
So where am i ?

Which Travels Faster? Solve below famous picture riddle:

What's the only room from which no one can enter or leave

What word is represented by this rebus?