Can you solve this picture maths equation?

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

Two men are in a desert. They both have packs on. One of the guys is dead. The guy alive has his pack open, and the guy who is dead has his pack closed. What is in the pack?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

Three doctors said that Bill was their brother. Bill says he has no brothers. How many brothers does Bill actually have?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

Christina makes tasty toast in a small pan. After toasting one side of a slice, she turns it over. Each side takes 30 seconds. The pan can only hold two slices.
How can she toast both sides of three slices in 1 & 1/2 instead of 2 minutes?

Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

How is a fly different from a mosquito?