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 ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

If 1+9+8=1, what is 2+8+9?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I cannot talk, but I always reply when spoken to. What am I?

How many Watermelons are there in the below picture?

How far can you walk into the woods?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?