If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

John gave half of the apples he had plus one more to Jacob. He gave half of the remaining ones plus one more to James. Now, John was left with just one apple.

Can you find out how many did he have in the beginning?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

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

What do you get if you add 2 to 100 four times?

Why do people go to bed?

What is the last thing you take off before bed?

If it took eight men ten hours to build a wall, how long would it take four men to build it?