Can you replace the question mark with the correct number?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

What number comes next in this sequence:
7 8 5 5 3 4 4 _

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

In which direction should the missing arrow point?

I know a 5-digit number having a property that With a 1 after it, it is three times as large as it would be with a one before it.

Guess the number?

What number should come in place of the question mark below?