What goes up but never comes down?

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

What goes up but never comes down?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

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?

How do you go from 98 to 720 using just one letter?

I have an apple tree , number of apple in this tree get doubles every week.

On 30th week , the tree gets completely filled with apples :-)



Can you tell me , on what week does my tree is half covered with apples ?