What do you answer even though it never asks you questions?

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?

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

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

Decode below rebus
D
N
A
T
S , D

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?