The recipe requires 1/8 tsp of black pepper.
Robbie has to make 4 batches of the soup.
So Robbie needs 1/2 tsp of black pepper.
[tex]4\times\frac{1}{8}=\frac{4}{8}=\frac{1}{2}[/tex]
Therefore, Robbie needs 1/2 teaspoon of black pepper to make 4 batches.
Since he has 1/3 teaspoon, he does not have enough black pepper for 4 batches of the soup.
(1/3 is less than 1/2)
