1. **State the problem:** Tristan has 15 feet of ribbon and each box of candy requires $\frac{1}{2}$ foot of ribbon. We need to find how many boxes he can tie with the ribbon. 2. **Formula used:** To find the number of boxes, divide the total ribbon length by the ribbon needed per box: $$\text{Number of boxes} = \frac{\text{Total ribbon}}{\text{Ribbon per box}}$$ 3. **Apply the values:** $$\text{Number of boxes} = \frac{15}{\frac{1}{2}}$$ 4. **Dividing by a fraction:** Dividing by $\frac{1}{2}$ is the same as multiplying by its reciprocal $2$: $$\frac{15}{\frac{1}{2}} = 15 \times 2$$ 5. **Calculate:** $$15 \times 2 = 30$$ 6. **Answer:** Tristan can tie **30 boxes** of candy with 15 feet of ribbon. This means he can tie 30 boxes because each box uses half a foot, and 15 feet divided by half a foot per box equals 30 boxes.