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

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

Why Wine Glass Stem is so long?

What word is pronounced the same if you take away four of its five letters?

You walk into a room where there are three primates held in their respective cages:
1) A lion who is eating the flesh of a goat.
2) An orangutan who is playing with blocks.
3) A donkey who is sitting idle.

Who is the most intelligent primate in the room?

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

If Japan and Panama decided to merge into a single country, probably people will name it Japanama.

Can you think of two more such country's unions that could produce similar names like Japanama by overlapping their three letters?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

What is the relationship between these matchstick pictures below?