To find the cache, just solve these simple problems:
These first two are from a letter Richard Feynman wrote to his
mother on Feb 29, 1944:
I go shopping for oranges. In one store oranges are 2 for 5
cents, and in another store are 3 cents each. If I end up spending
19 cents for oranges, how many did I buy? This number is
A.
In the question above, what is the largest number of cents that
I could have said instead of 19 so that you could still be sure of
how many were bought? This is BC.
This problem is from a newsletter from a nearby Queen Anne
Elementary School:
If I can buy Chicken McTaquitos in 3-packs, 6-packs and
20-packs, what is the largest number of McTaquitos I can not
buy? For example, I can buy 15 McTaquitos (2 6-packs and 1
3-pack), or 23 (1 20-pack and 1 3-pack), but not 17. Call
this number DE.
The cache is located at 47 40.(E-A)(B-C)(E-D-D) -122
22.(E+B)(E+C)(E-A+1)
You're looking for a small Lock'n'Lock container. As always,
please use stealth while searching.