If "P" means "-", "Q" means "/", "R" means "+", and "S" means "*" then find the value of the following:

21 Q 7 R 9 S 10 P 13

John was visiting his friend Jacob. He found out that his friend's wife had just killed a burglar in self-defense.
John asks Jacob about what happened and he told that "His wife was watching television when suddenly the bell rang. She thought that it is her husband Jacob but she found the burglar who attacked her instantly and she got so frightened that she killed the burglar immediately with the knife.
John asked the police to arrest his friend's wife. Why?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Find the number of squares in the below-given picture.

Find the missing number in the sequence below:

What four weights can be used to balance from 1 to 30 pounds?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

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

What does the below rebus puzzle mean?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?