If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

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?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

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

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

By what process could you make a 'Tea-Table' into food?