Replace the question mark with the correct number in the below-given picture?

You are mixing a mixture of cement and Sand with five gallons of water. You have a garden hose giving you all the water you need. The problem is that you only have a four-gallon bucket and a seven-gallon bucket and neither has graduation marks. Find a method to measure five gallons.

Buy me, smell me or deliver me, I do not change.

Who am I?

Can you count the chocolates in hand?

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

What has one eye, but can’t see?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

In the formation, you can see a few arranged matchsticks. Can you form three squares by moving just three matchsticks?

What part of Turkey has the most feathers?