Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you find out the remainder when 3^300 is divided by 5?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

I have two coins.
* One of the coins is a faulty coin having a tail on both sides of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blindfold myself and pick a coin and put the coin on the table. The face of the coin towards the sky is the tail.

What is the probability that another side is also tail?

Rectify the following equality 101 - 102 = 1 by moving just one digit.

Can you find a number that lies one third of the distance between 1/3 and 2/3?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable