Final answer:
By setting up a proportion, we find that Sandy will need 16 1/2 pounds of clay to make 27 small vases, corresponding to option a).
Step-by-step explanation:
To find out how many pounds of clay are needed for 27 small vases, we shall setup a proportion based on the given that Sandy uses 5 1/2 pounds of clay to make 9 small vases. We write the proportion as:
\(
\frac{5.5 \text{ pounds of clay}}{9 \text{ small vases}} = \frac{x \text{ pounds of clay}}{27 \text{ small vases}}
\)
To solve for \(x\), we cross-multiply:
\(5.5 \times 27 = 9 \times x\)
\(148.5 = 9x\)
Now, divide both sides by 9 to isolate \(x\):
\(x = \frac{148.5}{9}\)
\(x = 16.5\)
Therefore, Sandy will use 16 1/2 pounds of clay to make 27 small vases, which matches option a).