Set this up as a proportion with seeds on top and plants on bottom. Ours will look like this:

. Cross multiply to get 12x=1092. Divide to get that the number of plants to expect from 156 seeds is 91, choice B from above.
To figure this out just multiply 9 by 38... Which is 342.
5packages*7/8pounds=35/8 or 4 3/8 or 4.375 pound of fish
Answer=4 3/8 pounds of fish