This is the concept of algebra, the average number of muffins baked by each girl will be given as follows; Muffins baked by Andrea=h muffins Muffins baked by Violet =h-8
Average=(Total sum of numbers)/(Number of items) total sum=h+(h-8)=2h-8 Number of items=2 thus; average=(2h-8)/2=h-4 the answer in terms of h is (h-4)
