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

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

Can you count the number of matches in the picture below ?

Which flower has two lips?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

What does the below rebus riddle means?

Solve the following series:
AZ, GT, MN, __, YB

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

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 number one disappear by adding something to it?

If 2 workers can complete painting 2 walls in exactly 2 hours.

How many workers would be needed to paint 18 walls in 6 hours?