Wyssjami

Hello, I am attempting my fist multi location cache and the second step requires me to subtract a number from a set of coordinates. “Subtract the grand total of the letters from the coords of: N 44 40.143 W 084 39.905 (both N and W coords. Ignore the decimal points.) to find the final cache.” The number we got was 91, but I’m not sure how to subtract that at all. Any help is appreciated!