What is both possible and impossible at the same time?

If you say my name, I will no longer exist. What am I?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

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.

Replace all '*' with digits 1, 2, 3, 4, 5 and 6 to make below statement true.

* *
x *
=====
* * *

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

Which tank will fill first?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

I don't get anymore wetter, no matter how much rain falls on me.

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?