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

Why Wine Glass Stem is so long?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

What is black when you buy it, red when you use it, and gray when you throw it away?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

You’re out on the water and see a boat filled with people. You look away for a second and look back again, but this time you don’t see a single person on the boat. Why? Hint: The boat did not sink.

What will you call your mother's brother's brother-in-law?

Which Travels Faster? Solve below famous picture riddle:

'S' refers to the number of seconds in a day and 'H' refers to the number of hours in ten years. Which quantity out of these two is greater?

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?