Answer:
brad made 19 cakes, sally made 12
Step-by-step explanation:
-1
n (aub)= n (a)+ n(b)
n (anb) = n (a)-n (b)
only a= n(a)+n(b) -(aub)
n only b= n (a)+n (b)-n (anb)
now solve your self because this formula help to solve
