Identify the hidden meaning behind this picture?

Can you replace the question mark with the correct number in the below table sequence?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

A crime was committed at baker street. Ibrahim Dakota who was shot in the stomach was the main suspect. Sherlock questioned the suspect. The conversation started as:
Sherlock: What's your story, Ibrahim?
Ibrahim: I was walking around baker street and suddenly a man from the back shot me. I ran as fast as I could to save my life".
Sherlock: That is enough (and ask the police to arrest him).

Why does Sherlock think he is the murderer?

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

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

Which of the following words don't belong in the group and why?
CORSET, COSTER, SECTOR, ESCORT, COURTS

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

With the help clues provided in the image, can you find the 5 digit key?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?