Venn Diagram Languages
1. **Problem Statement:** We have 32 students studying at least one of French (F), Spanish (S), or German (G). Given counts for each language and their intersections, we need to find $x$, the number of students studying both Spanish and German.
2. **Given Data:**
- Total students $U = 32$
- $|F| = 20$
- $|S| = 18$
- $|G| = 12$
- $|F \cap S| = 10$
- $|F \cap G| = 6$
- $|S \cap G| = x$
- $|F \cap S \cap G| = 3$
- Every student studies at least one language.
3. **Important Formula:**
The principle of inclusion-exclusion for three sets:
$$|F \cup S \cup G| = |F| + |S| + |G| - |F \cap S| - |S \cap G| - |F \cap G| + |F \cap S \cap G|$$
Since every student studies at least one language, $|F \cup S \cup G| = 32$.
4. **Substitute known values:**
$$32 = 20 + 18 + 12 - 10 - x - 6 + 3$$
5. **Simplify the right side:**
$$32 = 50 - 10 - x - 6 + 3$$
$$32 = 50 - 13 - x$$
$$32 = 37 - x$$
6. **Solve for $x$:**
$$x = 37 - 32 = 5$$
7. **Interpretation:**
The number of students studying both Spanish and German is $x = 5$.
8. **Verify with the Venn diagram values:**
- Intersection $S \cap G = 5$
- Intersection $F \cap S = 10$
- Intersection $F \cap G = 6$
- Triple intersection $F \cap S \cap G = 3$
All values are consistent with the problem's handwritten notes.
**Final answer:**
$$\boxed{5}$$