well the problem that is solved is to be able to contact people but using the phone to much close to your head it can cause brain tumors
Reducing equivalent fractions to their simplest form.
Problems involving the addition and subtraction of unlike fractions.
public transportation strike
Reducing fractions
Problems of morality. Premarital sex of teens would be solved that way then.
Alot of problems were solved through the use of trig. To many to count in fact. The Sears tower would be an example I can think of. But good question.
they solved their promblems by thinking about it and testing.
For reducing fractions to their lowest terms
Problems that are not promptly solved create more problems.
The cellphone never had any problems inventing it as it did not invent anything.
Commerce problems could be solved with trade
what are 2 problems that were solved by the invention of trains