Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Can you replace the question mark with the correct number in the below table sequence?

The answer I give is yes, but what I mean is no. What was the question?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

I make two people out of one. What am I?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

John Went to the nearby store in a Mall to buy something for her home. Below is the conversation between the two:

John: How much for the one?
Shopkeeper: It is $2
John: How much for the Eleven?
Shopkeeper: It is $4
John: How much for the Hundred?
Shopkeeper: It is $6.

What is John buying?

What you cannot hold but it is yours?

What does below pictogram mean?