Using Only Five 5's and any mathematical operator make sum as 37

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

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

Where do fish keep their money?

I have an eye but still cannot see.

Who am I?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Considering the below equation:

V + II - VI = 10
IV - X + VIII = 20
IV - VII + VI = 30

Then, I + II + III = ?