To find out how many pounds of chocolate candy Ruben bought, we need to calculate \( \frac{1}{3} \) of the total candy he purchased, which is 56 pounds.
We can calculate this as follows:
\[ \text{Chocolate candy} = \frac{1}{3} \times 56 = \frac{56}{3} \]
Now, we will divide 56 by 3:
\[ 56 \div 3 = 18 \quad \text{remainder } 2 \]
This means that \( 56 \) can be expressed as:
\[ 56 = 3 \times 18 + 2 \]
So, we can write \( \frac{56}{3} \) as a mixed number:
\[ \frac{56}{3} = 18 \frac{2}{3} \]
Thus, the amount of chocolate candy Ruben bought is:
\[ \frac{56}{3} \text{ pounds} \quad \text{or} \quad 18 \frac{2}{3} \text{ pounds} \]