T solve for XXX, subtract the population of Blackduck as of the 1940 Census from the year Blackduck was incorporated, add 37 and then divide by 2.
You can check your answers for this puzzle on GeoChecker.com.
All logs must be signed to be claimed as a find. If you cannot find a cache, please DO NOT replace it with a throwdown.Please replace the cache as you found it so everyone can have fun.