But how do they connect to your network in order to access this web app? If the WiFi network credentials are needed to access the network that has the QR code for the network credentials, this sounds like a Catch 22.
Also, is a QR code useful if the web app is opened on the very phone needing the credentials? Perhaps other phones are different, but my smartphone is unable to scan a QR code that is on the display.
Another example of 120: the California State Legislature is a bicameral body with 120 total members, with 80 in the Assembly (lower house) and 40 in the Senate (upper house).
And a related piece of trivia regarding fractional currencies: although the USD has been decimalized more-or-less since its inception, the USA stock markets continued to use fractional prices for shares up until 2001, down to 1/16 of a dollar.