The main role of the UN is to serve as a forum where nations may solve any issues affecting the realtions between them, it is not an organization empowered to solve situations by itself, all depends on the participation, good will and cooperation of the member nations themselves.
Problems that are not promptly solved create more problems.
Commerce problems could be solved with trade
what are 2 problems that were solved by the invention of trains
none
they solved their problems by farming
It solved no problems but created enormous problems.
Mainly health problems.
Reducing equivalent fractions to their simplest form.
K = D + 3 where the letters represent the number of problems solved by Ki and Daniel respectively.
it solved plants
yes
That is why there is 7 books. The problems are all solved in the end of the 7th book.