I shave every day, but my beard stays the same. What am I?

The captain of a ship was telling this interesting story: "We travelled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly." How can that be possible?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

Whats the next number in the below number sequence pattern.

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

In the image below, can you find the value of an angle(y)