No one wants to have it, but if one got it, he does not want to lose it. What is It?

If 21x = 79x, what is the value of x?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What goes up but never comes down?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

I have branches, but no fruit, trunk or leaves. What am I?

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

John is found dead in his office at his desk. The police have narrowed the suspects down to three people: Mrs. Jacob, John’s wife Hena and his business partner Jason . All three visited John on the day of his murder, but all three provide the police with stories of explanation as to the reason for their visit.
Police found John with his wrist watch still on his right arm, a torn up picture of his wife laying on the floor beside the trash can, and an ink pen in his right hand. On the desk, the police found a name plate, a telephone that was off the hook, and a personal calendar turned to the July 5th page with 7B91011 written on it. After examining this evidence, the police knew their suspect. Who was it ?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?