Replace the question mark with the number below given a simple math problem.

How is a fly different from a mosquito?

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

I look at you, you look at me, I raise my right, you raise your left. What am I?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

How many letters are in the alphabet?

Can you find the company name in the pictogram below?

A man fell off a smuggling boat into deep water. He could not swim and he was not wearing anything to keep him afloat. It took 30 minutes for the people on the boat to realize someone was missing. The missing man was rescued two hours later on the return trip. Why didn't he drown? Note:- He didn't know swimming, the sea was deep, and He wasn't holding anything

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?