Replace the question mark with the correct number.

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

How many times in a given day, minutes and hour clock comes in a straight line ?

I have a five and a three-gallon jar. Assuming there is an infinite supply of water, how can I measure one-gallon water?

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

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

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

Today is John's birthday.
A year ago, John had five candles and he lit all the candles except the one at the last.
Now he is going to light all the candles.

How old is John Today?

(He is not five today.....)

Find the next number in the series below.

6 18 270 72090 ?

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.