Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

What is the difference between a jeweller and a jailer?

What four weights can be used to balance from 1 to 30 pounds?

What work can one never finish?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What can jump higher than a building?

Can you count the number of lines in the below picture?

Andrew sees a very rare bird named "Ruppell's vulture". Soon Andrew was dead. Can you explain the mystery, Mr. Sherlock?