What goes up but never comes down?

What is always in front of you but can’t be seen?

How is a fly different from a mosquito?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

They are the five precious gems of an everyday sort and all can be found on a Tennis Court. Who are they?

Detective John was investigating a murder in China.
It was a difficult case, and John was completely stumped until he noticed a message sent to him by the killer cunningly hidden in a newspaper advertisement selling Car Licence Plates.
Detective John thought about it for a while, and when he had solved the puzzle, immediately arrested the guilty man.

Q1) How did John know the advert was a clue for him?

Q2) Solve the code and tell me who John arrested.

This is the newspaper advert (Car licence plates for sale) that Detective John saw.

Plates For Sale;

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