Find the next number in the series below

21 32 54 87 131 ?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

What type of tree can I carry in my hand?

What is full of holes but still holds water?

A man was going to bleach his socks because they had gotten muddy the day before. As he was pouring the bleach into the washing machine, he spilt some on the floor. He got some cleaning fluid and mopped it up with a rag. Minutes later he was dead. What killed him?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

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

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

Move four matchsticks to the below square to form three squares?