What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

How many bananas can you eat if your stomach is empty?

Find the 8 in the below-given Image.

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

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 ?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

Take away the whole and some still remain. What is it?