Multi cache at the iron age museum, you are looking for a large stone plaque out the front of the museum to do with the buildings earlier use.
When was the school founded = ABCD
N51 AD (A+B)C(A+D)
W001 DC. C(A+C)(C-A)
After working out the cords why not pop into the museum its free!! (not open Mondays)
gerr (nobhg n 5 zva jnyx sebz gur zhfrhz)naq lbh fubhyq or fgbbq irel arne gur evire...