Since 1/4 of the fish is salmon, and the other 1/4 were halibut, then if you add it together you get 1/2. And since, the remaining were herring then, that is the other half because one fourth plus one fourth equals to a half. Then if you add a half plus a half, then you get a whole. whole. If the remaining is herring, then it is representing the half. So half (30) plus another half(30) equals to 60, which is the amount of fish Stephen caught in his dream. Hope it helps!
-1/2 amount of fish were herring -There are 60 fish in all
You have to add the 480 dollars which eliminates A and C. Then, when finding commission you make the commission rate into decimal form which eliminates D. Your only option left is B