Lernu says: jen (jen)<pre>
look! behold! here is/are; there is/are; jen... jen... = sometimes... sometimes...</pre>
I got this wrong through a typo (my fault) but the correct answer given was 'Here's three girls and two boys'. "Here'S!!!" You mean, "here ARE".
I guarantee that in some other thread, someone typed "Here's" and then complained when the system corrected them to "here are". Remember, this is a course to learn Esperanto, not to quibble about English.
"Estas tri knabinoj kaj du knaboj"
'there' in an english sentence like like is a formality, like 'it' in "it's raining", cuz english verbs need subjects. Esperanto has no such requirement
Are voices crowdsourced now? Does anyone even check what it sounds like?