"Mengapa di sini ramai sekali?"

Translation: Why is it so noisy here?

[Rick392366]

"Why is it so crowded here ?" not accepted as correct answer.

Dear Duolingo, please reconsider this as a correct alternative answer.
"ramai" can mean "crowded".

[Speedy12846]

Crowded and noisy don't mean the same thing.

[LuQLingo]

Both noisy and crowded have been given as translations for 'ramai'. There is no context to know which is required in this example, so both should be accepted.

[Ria___]

I thought there are a number of synonyms that should be accepted, am I wrong? e.g. loud, lively, exciting, etc

[Bev425285]

Why mengapa rather than kenapa?

[Diponegoro57]

As far as I know they are completely interchangeable, so both should be accepted. I suggest that you report if 'kenapa' is being marked as incorrect.