It’s weird i know my measurement in both metric and imperial because when I was a child i learnt to play lawn bowls and all the old people measured everything in inches feet and yards, then when I became a mechanic there’s the three spanner sets so I can do all those.

As for tips, I worked out my own pace count for 100 meters, and at my old workshop we had meter increments on the floor so you could work out what kinda goofy arse step you need to take for 1 meter.

Temperature obviously 0 is frozen water 100 boiling anything over 40 is damn hot outside but that one varies for person to person.

Second strong especially because you can one time purchase it and not pay a damn subscription for ever

I learnt to solve them in school 17 years ago or so. There’s guides etc on the internet its really simple when you memories the steps.

The real fun part for me is only solving the first layer and the T on the side since after that it’s just memorised steps and nothing more

As for you question, I would say be proud it’s showed dedication to something he wanted to learn

Write “Return to sender, not at this adress” on the envelope and put it back in the mail.

Sorry not sorry