Find the hidden tiger in the given optical illusion ?

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.

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

What is the word or phrase below?
R | E | A | D

There is something which you can be arrested for attempting but not for successfully completing.

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Buy me, smell me or deliver me, I do not change.

Who am I?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?