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

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

what does the below math rebus puzzle mean?

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

If your uncle’s sister is not your aunt, what relation is she to you?

Look at the picture and find out which square is not linked with any of the other squares.

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

A game is being played where eight players can last for thirty-five minutes. Six substitutes alternate with each player in this game. Thus, all players are on the pitch for the same amount of time including the substitutes.

For how long is each player on the pitch?

If six children and two dogs were under an umbrella, how come none of them got wet?

I know a nine-letter word having only one vowel.
Do you ?

Can you place three balls such that the equation shown in the picture holds true?