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

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

Astrology starts with the alphabet A, Biology starts with B, Psychology with P and Limnology with L.

Can you find an "ology" that begins with a P?

Find the Goldfish below the given Image.

Solve The below Equation:

ALFA + BETA + GAMA = DELTA

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

How can you make number one disappear by adding something to it?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

How many letters are in the alphabet?

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?