Find the next number in the sequence

5 12 24 36 ?

What does below Rebus say?

XLR8

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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

The centre of the third figure is empty. What digit should fit inside?

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

Can you count the number of lines in the below picture?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?