Question 907232
Increase every ingredient quantity by {{{75/6}}}.  The focus seems to be on the sugar.   {{{(75/6)(1/2)=6&1/4}}} cups sugar needed.  That is how many cups sugar needed for the expected 75 people.


Now you need the two conversion factors.  You know already 0.5 pounds per cup and given 2.2 pounds per kilogram.  You do what you need!


NEEDED:
{{{(75/12)}}} cups of sugar.


{{{(75/12)*cups*(1/2)*(pounds/cup)*(1/2.2)*(kilograms/pounds)}}}
{{{(75/12)(1/2)(1/2.2)*kilogramsOfSugarNeeded}}}
{{{((75)/(12*2*2.2))*kilogramsOfSugarNeeded}}}
{{{highlight(1.42)}}} kilograms sugar needed

This is probably good enough for the cafeteria, depending on how strictly the recipe works with its ingredients and quantities.  Conservatively in mind, 1.42 kilograms is not enough if the scaled recipe calls for 1.5 kilograms.