Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Edward James went for tiger hunting.

It was not his lucky day.



He got six tigers without heads, nine tigers without the tail and eight cut in two halves.

How many tiger did he hunted ?

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

When 99 is considered higher than 100?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?

Using Only Five 5's and any mathematical operator make sum as 37