Petals Around the Rose: Fraternity Register

Thank you for this.
After doing many calculations in our favoured base 10, and then in octal and binary I was thoroughly confused.
I would also like to thank the tobacco companies. Although nicotone is a dangerous drug it did aid me in discovering the solution to this problem.
It wasn't until I threw my hands up and walked away in disgust that I realised the error of my ways.
The 'basic mathematics' required is just that.
I look forward to showing this to my 11 year old son who I am sure will solve this faster than I did.

Peter. Brisbane, Australia.