Answer:
For #4: 16.
For #5: 1/6
Explanation:
#4: First add the 2 1/2 and the 1 1/2 and you get 4.
Then, add 4. You get 8, right? But we aren't done, becuase it says "how many 1/2 pound packages can she make". So that's 8 pounds x 2 (becuase there are 2 1/2s in each whole). So 16 one-half pound packages.
#5: She had already used 2/3 of the package. The leftovers? 1/3. Since she made 2 more batches of cornbread equal, you would divide 1/3 by 2, getting 1/6.