Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

What is the difference between a jeweller and a jailer?

A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

During a secret mission, an agent gave the following code to the higher authorities
AIM DUE OAT TIE MOD

However, the information is in one word only and the rest are fake. To assist the authorities in understanding better, he also sent them a clue, If I tell you any one character of the code, you can easily find out the number of vowels in the codeword.

Can you find out the code word?

What has one letter and starts with an E?