How do i say in spanish "it was very nice to meet you guys"
Fue un placer conocerlos: if the group is all male/ males+female(s). Fue un placer conocerlas: if the group is all females.
It was a pleasure to meet you (plural).
Or, fue muy agradable conocerlos/las: It was very nice to meet you (plural).
Monica, if you are going to say it formally,at the time it would be
Encantada de conocerles =Pleased to meet you (present tense)
or if you say it later, after the meeting it would be better to say:
Fue un placer conocerles = It was a pleasure to meet you
I hope that helps you