This is a perfectly valid question; I don't see why you would vote it down. Boys would have to be in oblique case. They (the ones here) go over to those boys (over there), ये उन लरके जाते हैं
So if you say They (the ones over there) go over to those boys (over there), वे उन लरके जाते हैं, and you then leave out those, you're left with they go over to the boys, वे लरके जाते हैं। I see what you're getting at. There's something to it. I think the answer might be... yes? Lots of reservations here...
Adding to the confusion then by that same token वे लरके जाते हैं might also mean they go over to the boy (singular), since the oblique form of लरका and लरके alike is लरके. Applying honorific plural, this sentence could also mean (s)he goes over to the boy(s), right?
If you think the suggested translation is nonsensical then puh-lease this is Duolingo.
Not a hindi speaker, disclaimers apply.