Eight of us go fourth, not back, to protect our king from an attack. What are we?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

What has many teeth, but cannot bite?

To attend world science seminar, A famous chemist from Mexico visit
London. In the lab, the scientist was killed and his six assistants were under suspicion of killing the chemist.
Name of six assistants: Austin, Wayne, Dege, Oscaru, Lingard, and Rojo.
He left a note "76-20-44 79-16-22-7"

A local detective Jack was called to solve the case,

After reading the note, Jack instantly asked the police to arrest the murderers.

Who are the murderers?

How many times can you subtract the number two from the number fifty?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Can you find the thief by just looking at the picture below?

Why despite killing dozens of people Charley and Wilma were not punished?

Which digit occurred maximum times between the number 1 and 1000?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?