Look at Mathematics! problem solving is an inherrent culture hidden in Mathematics!
Let us analyse what is a 'problem'?
Mathematically a problem fix a solution! Problem solving is definitely associated to each problem!
We shall put it as... Most countries use 'a unit-currency' and a percentage split of said a unit-currency! It leads to an uneasy number application by all concerned currency users forever!
Cause of it is higher unit value fixed to 'a unit-currency'! I will say that a problem has been created by a concerned Government by fixing 'high unit-value' of base-currency!
Countries like Japan and Italy use currencies of low-unit value (with out percent split of their base currency), which consistently helps general public! You will find that problems emerge from outlook of Governments!
Majority of problems are related to work culture! People live with said problems as they cannot initiate alternate methods!
Challenging a problem is a good idea! But challenging whom? When computers are so powerful tools for number application how can you challenge 'a flaw of number application'! If said challenging could revive vitality of number application "challenging is meaningful" else it is foolishness!
What you will do? Challenge or neglect? Think over it!
I have given answer to your question to an extend I have understood it!
I am aware that there is a another side to your question! Challenges in an expanding knowledge application scenario is fuitile! If you can propagate a superior knowledge worldwide and instantly said challenge is worth doing! Not today! let us do it tomorrow!