Replace the question mark with the correct number in the below-given picture?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

What has 13 hearts but no other organs?

The Brit lives in the red house.
2. The Swede keeps dogs as pets.
3. The Dane drinks tea.
4. The greenhouse is on the immediate left of the white house.
5. The greenhouse’s owner drinks coffee.
6. The owner who smokes Pall Mall rears birds.
7. The owner of the yellow house smokes Dunhill.
8. The owner living in the centre house drinks milk.
9. The Norwegian lives in the first house.
10. The owner who smokes Blends lives next to the one who keeps cats.
11. The owner who keeps the horse lives next to the one who smokes Dunhill.
12. The owner who smokes blue masters drinks beer.
13. The German smokes Prince.
14. The Norwegian lives next to the blue house.
15. The owner who smokes Blends lives next to the one who drinks water.
Now, the question is…Who owns the fish?

Which digit occurred maximum times between the number 1 and 1000?

Can you name some countries which do not have the alphabet 'A' in them?

Count the number of triangles in the picture below:

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Can you find out the total number of triangles in the given figure?