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GCHQ Puzzle Challenge 12 – Harry’s Hint

Look there is a Caesar salad on the (periodic) table!

If

2 + 4 = 3

7 + 1 = 8

12 + 1 = 113

13 + 2 = 112

20 + 1 = 105

Then what does 10 – 1 equal?

Still stuck on the most cryptic of our GCHQ Puzzle Challenges so far? Making you depressed? Consider this a hint! Good luck!