What does this rebus mean?

O
N
C
E
TIME

Keyboard words are not in alphabetical order, Why?

Solve this tricky question. You are trapped in a forest. With you, you have a gun preloaded with two bullets in it. In front of you, there is a tiger, a leopard and a jaguar.

How do you survive?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

Forwards I am heavy, backward I am not. What am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

If eleven plus two equals one, what does nine plus five equal?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.