A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

By what process could you make a 'Tea-Table' into food?

Count the number of squares in the picture below.

What word begins and ends with an E, but has only one letter?

Imagine you are in a room with no windows or doors. How will you get out?

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

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS