Can you find out the total number of triangles in the given figure?

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

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

I make two people out of one. What am I?

Below rebus represent famous DiCaprio movie. Can you name it?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.

In a mathematical quiz, you are asked the following question:

Use three 9s in a mathematical expression without dividing or multiplying to form the number one.

Can you answer the question?