Which fur should we be getting from the Lion?

Considering the below equation:

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

Then, I + II + III = ?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

What does below pictogram mean?

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

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

Most people think of me as money. But when they find me in the water, they won’t get any money out of me. What am I?

What is the word or phrase?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?