borntobealoser is one smart Highway Warrior!

Apparently you still have to know math even after the Apocalypse, which frankly is a big time bummer. Luckily we have borntobealoser on our side, as he utterly dominated the keypad puzzle facing us in front of the Big Steel Door at the local university. Here was his solution:

Right, I’ve literally only looked at the puzzle for a few seconds, and I’m shouting the first thought that came into my head. Forgive me if I’m wrong, but don’t you get the last number of each row if you add the first 2 numbers of each row and take away the third number in the row?

Like this:
2 + 12 = 14, 14 – 5 = 9.
4 + 20 = 24, 24 – 7 = 17.

So, going on that, surely it’s:
12 + 12 = 24, 24 – 4 = 20.

If that’s wrong, I’m going to look like a total idiot…

Guess what? You do not look like an idiot, you look like a genius!

This solution was a lot better than my "Click randomly on every possible number" approach, the legacy of a university education much heavier on English and Art than was probably good for me.

We already have a Geiger counter, fortunately, but I went ahead and loaded up on the rest of the stuff.

Throwing the salt into the pack puts us pretty full. Here's what we look like at this point.

Now we can tell whether or not we're entering a high-radiation zone, we can put on our rad suit if we are, and we can lather ourselves with salt so in case we get cooked we automatically get turned into Human Jerky! Good times. Plus we have twice as much ammo as Barney Fife, which makes me feel much more secure.

Here's the direct link to the aforementioned map, by the way.

So which way shall we go, intrepid adventurers?

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