Meaning of “solve” - Learner’s Dictionary

solve

verb [ T ] us uk /sɒlv/
He never gave up hope that he would solve the mystery of his son's disappearance.Scientists have been trying to solve this puzzle for years.They solved their problem without recourse to violence.Scientists may have solved the riddle of Saturn's rings.It's proving a difficult problem to solve.

B1 to find the answer to something:

to solve / a problem
to solve / a mystery/puzzle
Police are still no nearer to solving / the crime.

(Definition of “solve” from the Cambridge Learner’s Dictionary © Cambridge University Press)