What is the below Rebus indicate?

Replace the question mark in the picture below.

With the help clues provided in the image, can you find the 5 digit key?

I can write cow in 13 letters.

Can You?

There are forty elephants and they have forty-fore heads. How can this be possible?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

One night, a woman receives a call from the police. They tell her that her husband was murdered and that she should come to the crime scene as soon as possible. The woman drops the phone, shocked, and drives 20 minutes to the crime scene. As soon as she reaches the crime scene, the police arrest her and she is convicted of murder. How do the police know she committed the crime?

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?