Can you replace the question mark with the correct number?

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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You have 1023 apples and 10 bags. You have to distribute these apples in these 10 bags in any way you choose. But when I ask for a certain number of apples you have to give them in terms of bags without transferring the apples from other bags. How do you distribute the apples?

A blonde put eyeliner on her head. Why?

The Puzzle: Here is a famous prize problem that Sam Loyd issued in 1882, offering $1000 as a prize for the best answer showing how to arrange the seven figures and the eight 'dots' .4.5.6.7.8.9.0. which would add up to 82

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

Rumel, A detective who was mere days from cracking an international smuggling ring has suddenly gone missing. While inspecting his last-known location, you find a note:

710 57735 34 5508 51 7718

Currently, there are 3 suspects: Bill, John, and Todd. Can you break the detective's code and find the criminal's name?