What does this rebus mean?

O
N
C
E
TIME

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Decode below three cipher riddles:

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

Can you divide the below-given shape into four equal and identical pieces?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

What seven-letter word has hundreds of letters in it?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?