Respuesta :
Answer: There should be an "s" at the end of "chistoso".
Explanation: The word "chistoso" is talking about several boys in the sentence, not just one, so it's plural.
There would be an “S” at the end of Chistoso, basically it’s just like how we would add an “S” to show off plural wordings. So the correct sentence would be, “Los chicos son chistosos.”