Does it make sense that 80% of the solutions come from 20% of the causes?

Dear Sir, I will be thankful if you let me take TWO minutes of your precious time.
== What you have mentioned here is Pareto Principle.
Pareto analysis is a very simple technique that helps you to focus efforts on the problems that offer the greatest potential for improvement by showing their relative frequency or size in a descending bar graph.
== Pareto's principle, the80/20 rule asserts that for many events, roughly80% of the effects come from20% of the causes.
The80/20 principle should serve as a daily reminder to focus your time and energy on the issues that really make a difference.
== This tool or technique makes the first80% of a project easy but the last20% very difficult or impossible.
For example,80% of various instances follow a nice pattern, but20% deviate in unpredictable or random ways that bust our framework.
== More generally, the Pareto Principle is the observation (not law) that most things in life are not distributed evenly and helps you realize that the majority of results come from a minority of inputs.
So, it can help you identify which causes to work on first with the most potential for improvement, and it can mean all of the following things like: --20% of workers contribute80% of results: Focus on rewarding these employees.
--20% of bugs contribute80% of crashes: Focus on fixing these bugs first.
--20% of customers contribute80% of revenue: Focus on satisfying these customers.
--20% of the input creates80% of the result: Focus on managing these inputs.
--20% of the features cause80% of the usage: Focus on how to manipulate these features.
== But be careful when using this idea! First, there’s a common misconception that the numbers20 and80 must add to100 — they don’t! look at the following explain: =20% of the workers could create10% of the result.
Or50%.
Or80%.
Or99%, or even100%.
Think about it — in a group of100 workers,20 could do all the work while the other80 goof off.
In that case,20% of the workers did100% of the work.
Remember that the80/20 rule is a rough guide about typical distributions.
= Also recognize that the numbers don’t have to be “20%” and “80%” exactly.
The key point is that most things in life (effort, reward, output) are not distributed evenly – some contribute more than others.
= When we say “things aren't distributed evenly”, that is each unit of work (or time) doesn't contribute the same amount.
In a perfect world, every employee would contribute the same amount, every bug would be equally important, every feature would be equally loved by users.
Planning would be so easy.
== If you've just stepped into a new role as head of department.
Unsurprisingly, you've inherited a whole host of problems that need your attention.
Ideally, you want to focus your attention on fixing the most important problems.
But how do you decide which problems you need to deal with first? And are some problems caused by the same underlying issue? ......The best solution is80/20 rule.
== My point is that this principle can be efficiently applied by tackling the causes with the highest score / frequency first as these offer the greatest benefit if resolved.
While causes with the lowest scores / frequencies may not be worth tackling as solving these problems, and may eventually cost you more than the solutions are worth.
YOU CAN TRY AND FIND OUT.
Best Regards, Lubna Al-Sharif

A great question Salah, This is a well-known principle also called (Pareto principle) used now-a-days in almost every field.
In general this is called as80/20 rule.
This can be applied to several situations.80/20 is not always accurate, it could be90/10, or95/5 per se.
The important point is that there are certain things that require your20% effort/quality time/input to achieve80% output/production/results.

YES NECESSITY IS THE MOTHER OF INVENTION.THE SHORTEST ANSWER THAT SHOULD BE GIVEN

I think it's make sense some time but i am not sure becouse it's the first time for me to hear this.

It means that20% of the countries worldwide controls most of the wealth wile80% of the countries worldwide doesnt , so if we stess on th e20% of the causes it will make agreat difference to go forward