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

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

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking

Can you quickly find which two matchstick figures are identical?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Can you find any error in the following sentence?

A taxi was standing outside a fort at night. A man came out of the fort, opened the gate and hit the taxi driver killing him instantly. He took all the money out of the meter and started running till he was caught by a local sheriff.

What is so fragile that saying its name breaks it?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

The dirtier I get, the whiter I look. Who am I?