Question: The container that holds the water for the football team is $\frac{1}{3}$ full. After pouring in 13 gallons of water, it is $\frac{1}{6}$ full. How many gallons can the container hold?
1. **State the problem:** We need to find the total capacity of the container in gallons.
2. **Define variables:** Let $C$ be the total capacity of the container in gallons.
3. **Translate the problem into equations:**
- Initially, the container is $\frac{1}{3}$ full, so it contains $\frac{1}{3}C$ gallons of water.
- After adding 13 gallons, the container is $\frac{1}{6}$ full, so it contains $\frac{1}{6}C$ gallons.
4. **Set up the equation:**
$$\frac{1}{3}C + 13 = \frac{1}{6}C$$
5. **Solve for $C$:**
$$\frac{1}{3}C + 13 = \frac{1}{6}C$$
Subtract $\frac{1}{6}C$ from both sides:
$$\frac{1}{3}C - \frac{1}{6}C + 13 = 0$$
Find common denominator and subtract:
$$\frac{2}{6}C - \frac{1}{6}C + 13 = 0$$
$$\frac{1}{6}C + 13 = 0$$
Subtract 13 from both sides:
$$\frac{1}{6}C = -13$$
This result is negative, which contradicts the problem context, so let's re-examine the problem statement carefully.
**Re-examining:** The problem states the container is $\frac{1}{3}$ full initially, and after adding 13 gallons, it is $\frac{1}{6}$ full. Since $\frac{1}{6}$ is less than $\frac{1}{3}$, adding water cannot reduce the water level. Possibly the problem meant the container was $\frac{1}{6}$ full after pouring out 13 gallons, or the fractions are reversed.
Assuming the problem meant the container was $\frac{1}{6}$ full initially and $\frac{1}{3}$ full after adding 13 gallons, then:
$$\frac{1}{6}C + 13 = \frac{1}{3}C$$
6. **Solve the corrected equation:**
$$\frac{1}{6}C + 13 = \frac{1}{3}C$$
Subtract $\frac{1}{6}C$ from both sides:
$$13 = \frac{1}{3}C - \frac{1}{6}C$$
$$13 = \frac{2}{6}C - \frac{1}{6}C$$
$$13 = \frac{1}{6}C$$
Multiply both sides by 6:
$$6 \times 13 = C$$
$$78 = C$$
7. **Answer:** The container can hold **78 gallons** of water.