Translation:They arrived at a solution.
"they came to a solution" not accepted?
I agree, arrived at....came to
it is now accepted 5.11.2014
'they found a solution' seems more natural
In my opinion " they came up with a solution" should be an acceptable answer. I think most native speakers would generally use the phrasal verb " come up with" in this situation rather than " come to a solution".
''found a solucion"" ?
Why not "they arrived at an answer"?
Sorry:: DL requires 'to', even though it is wrong in English. Here it is 'at' which I think is OK.