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

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

I can be cracked, made, told, and played. What am I?

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

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

I am white when I am dirty, and black when I am clean. What am I?

I had an infinite supply of water and 5 litres and 3 litres jars.

How would you measure exactly 4 litres in the least number of steps?

Given below is simple addition with a defined pattern pattern:
7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9

Can you analyze the pattern and find out the answer for:

4 + 9 = ?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

Using Only Five 5's and any mathematical operator make sum as 37