Multiple Servers Too Much Ram?

I have a simple PC
- 16 GB RAM
- GTX 1080
- I7 6700

And I'm making a Minigame server and I'm planning on making a lot of servers.
1 Server for 1 Minigame.

Example:
Survival Games - 1 Server // 1 GB Ram // 15 Players
KitPvP / Duels - 1 Server // 1 GB Ram // 15 Players
Lobby - 3 Servers // Each have 3GB // Max Players 100

I will obviously have more servers & minigames (custom ones)

Do i need to get like 64 GB ram for a big server like this?
Also, is 1-2GB RAM enough for a server with...

Multiple Servers Too Much Ram?