There is a box that is locked with a combination lock. The lock has four dials, each with digits from 0 to 9. The combination follows these rules:

The sum of all digits is 15.
The first digit is greater than the second digit.
The third digit is twice the fourth digit.

What could be the combination?

In a garden, there are five trees in a row. Each tree is either an apple tree or an orange tree. The first tree is an apple tree. If an apple tree is immediately followed by an orange tree, then the next tree after the orange tree must be an apple tree. How many possible arrangements of the five trees are there?

Adam was moving down in an elevator. The elevator stopped and the remorse on his face was clear. He knew Eve had died.

How did he know?

A few friends meet at a guesthouse. In the wake of the night, Aleph is killed by someone among them. Before Aleph breathes for the last time, he cleverly writes and marks something on his pocket calendar, careful not to write the name of the killer because he knows the killer is smart enough to get rid of any evidence. The police arrive at the crime scene and search for the evidence; not able to find any. Then they find a pocket calendar inside the inner pocket of the vic jacket. Attached is the image of the pocket calendar. Can you guess the name of the killer even though you don’t know the name of the friends?

Henry has been caught stealing cattle and is brought into town for justice. The judge is his ex-wife Gretchen, who wants to show him some sympathy, but the law calls for two shots to be taken at Henry from close range. To make things a little better for Henry, Gretchen tells him she will place two bullets into a six-chambered revolver in successive order. She will spin the chamber, close it, and take one shot. If Henry is still alive, she will then either take another shot, or spin the chamber again before shooting.

Henry is a bit incredulous that his ex-wife would carry out the punishment, and a bit sad that she was always such a rule follower. He steels himself as Gretchen loads the chambers, spins the revolver, and pulls the trigger. Whew! It was blank. Then Gretchen asks, ‘Do you want me to pull the trigger again, or should I spin the chamber a second time before pulling the trigger?’

What should Henry choose?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

A spaceship was lost. The detective was given a piece of paper. This was the location of the spaceship! This is what the slip had scribbled on it:
Juice, Umbrella, Potato, Ice, Tomato, Elephant, Rice.

Where is the spaceship?

A detective visits his friend John just to discover that John’s neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer’s name in a code word “Hcqtfz”. There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

Bopanna was working on a murder case when he received a message about the location of the murder weapon.
The message was encrypted as below.

“deb mitciv eht edisni neddih si nopaew redrum ehT”

Tell me the location of the murder weapon.