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?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

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?

Make the seating arrangement of 10 children in such a way that there are 5 rows with 4 children in each row.

I want to fill my bucket using both cold and hot water.
I have two taps for both cold and hot water. The hot water tap fills the bucket in exact 6 hours and the cold water tap fills the bucket in exact 4 hours.
I turn both of them simultaneously but I forgot to turn off another tap which removes the water out of the bucket. This tap can empty the bucket in 12 hours.

How Long will it take to fill the bucket?

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

It is always ahead of me yet I can never see it. What is it?

The dirtier I get, the whiter I look. Who am I?