Find the next number in the sequence

5 12 24 36 ?

How many words can a pen with half refill write?

I have nine bottles of wine and one of the nine bottles is poisoned.
I need to find the poisoned bottle with two facts
(1) Poison is deadly, only a sip will cost death
(2) I have two mice to do so.

How should I do it?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

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

How is the moon similar to a dollar?

Which country gets ill every time?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can anyone tell me a word in the English dictionary which has a silent 'z'?