Find the next number in the sequence

5 12 24 36 ?

Before Mount Everest was discovered, what was the highest mountain in the world?

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?

They are three errirs in this question. Can you find them?

How many triangles are there on the puzzle below?

Which tank will fill first?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

When it is alive we sing, when it is dead we clap our hands. What is it?

Which alphabet letter is a question?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?