Which is the smallest number that you can write using all the vowels exactly once?

If an electric train is travelling south, then which way is the smoke going?

Different lights make me strange by changing me into different sizes. What am I?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

What is full of holes but still holds water?

Can you count the number of squares in the figure below?

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?

Can you solve the below tricky visual equation?

What English word has three consecutive double letters?

Who always enjoys poor health?