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

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

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

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

What has many keys but can’t open a single lock?

For this puzzle, you might have to find logic in something illogical. But hey, it's fun and a healthy little break from your strenuous puzzle-solving sessions.

Can you decipher the meaning in the following cluster of letters?

ITIT,NCENTCENT

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

How can you make a TV, a bed, a dog, and a car liquid?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

What does below chemistry rebus means?