Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Which flower has two lips?

What does it mean?

What has one letter and starts with an E?

What is at the end of a rainbow?

I shave every day, but my beard stays the same. What am I?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

What does this rebus mean?

O
N
C
E
TIME

What kind of tree can you carry in your hand?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.