Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

I am sometimes honest
Sometimes dishonest
I can be sweet and also bitter
I can hurt you real bad and
also make u smile and blush ☺️
What am I?

Find the smallest sentence with all the English alphabet.

Queen Elizabeth organised a royal party.

To Avoid uninvited guest royal family set a password.
Jack (an uninvited person) plan to enter the party. He stand nearby the door.

First guest comes, the security person said 'twelve' and guest replied with six.
Second guest comes , the security person said 'six' and guest replied with 'three'.

Jack thought is enough and he walked to the entry point. The security person said 'eight' , Jack replied smilingly 'four'.
He was immediately thrown out of the party. why ?

The answer I give is yes, but what I mean is no. What was the question?

What English word has three consecutive double letters?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

John can eat 27 chocolates in an hour, Jacob can eat 2 chocolates in 10 minutes, and Jolly can eat 7 chocolates in 20 minutes. How long will it take them to share and eat a box of 120 chocolates whilst playing Chess?