There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?
What is the four-digit number in which the first digit is one-third the second, the third is the sum of the first two, and the last is three times the second?
You and your two friends are working in a multinational company. How can you three find out the average salary of you all without disclosing your own salary to the other two?
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?