Well....let's start with number of patches per person* area each patch covers
Each patch covers 6 sq inches and there will be 12 per person so 6*12=72
Now we do, solution of first problem * number of members
15 members and the solution was 72
Just to break the problem down further, I will do (10*72)+(5*72)
10*72=720
Since 5 is half of ten, but the second number is the same, then the answer of 5*72=360
720+360=1080
1080 is the answer in square inches
7.5 square feet is the answer you want