Answer:
15,75
Step-by-step explanation:
We assume, that the given numbers of pounds of pork and beef make up the total pounds of sausages (We don't add something else and we use all of the pork and the beef)
Then we can just add up the beef and the pork to get the total number of pounds for the sausages:
15 * 3/4 + 12 * 3/8 = 45/4 + 36/8
= 45/4 + 18/4 = 63/4 = 15,75
If we want to know how much one sausage weighs, divide this number by 8 (the question is not asking for this, right now, it is not important how many sausages we make)