You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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 ?

John was drowned by he was not wet. How?

Find out the missing number in the picture attached:

Can you tell a 3D object that has just two surfaces?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

What is the riddle which can be asked all day with a different correct answer each time.

A bomb exploded in a room full of married couples and no one died. How?

What do you call a fish without an eye?

Use the digits from 1 up to 9 and make 100.

Follow the rules.
=> Each digit should be used only once.
=> You can only use addition.
=> For making a number, two single digits can be combined (for example, 4 and 2 can be combined to form 42 or 24)
=> A fraction can also be made by combining the two single digits (for example, 4 and 2 can be combined to form 4/2 or 2/4)

Question: how can we do this?