Proving Abbot and Costello right

[lederhosen]

In case anybody doubts that 7x13=28, I wrote some SAS code to test it:

%let officers=9+4; /* 9 lieutenants, 4 captains */
%let donuts_per_officer=4+3; /* 4 plain, 3 fancy */

data total_needed;
officers=&officers;
donuts_per_officer=&donuts_per_officer;
total_donuts_needed=&officers*&donuts_per_officer;
run;

Result confirmed!