Determine all positive integers $n$ so that both $20n$ and $5n + 275$ are perfect squares.

(A perfect square is a number which can be expressed as $k^2$, where $k$ is an integer.)
1. **First Condition:**
   We are given that \(20n\) is a perfect square. Let \(20n = k^2\) for some integer \(k\). This implies:
   \[
   n = \frac{k^2}{20}
   \]
   For \(n\) to be an integer, \(k^2\) must be divisible by 20. Since 20 factors as \(2^2 \cdot 5\), \(k\) must be divisible by both 2 and 5. Let \(k = 10m\) for some integer \(m\). Then:
   \[
   k^2 = (10m)^2 = 100m^2
   \]
   Substituting back, we get:
   \[
   n = \frac{100m^2}{20} = 5m^2
   \]
   Therefore, \(n = 5m^2\) for some integer \(m\).

2. **Second Condition:**
   We are also given that \(5n + 275\) is a perfect square. Substituting \(n = 5m^2\) into this condition, we get:
   \[
   5(5m^2) + 275 = 25m^2 + 275
   \]
   Let this be equal to \(p^2\) for some integer \(p\):
   \[
   25m^2 + 275 = p^2
   \]
   Rearranging, we get:
   \[
   p^2 - 25m^2 = 275
   \]
   This is a difference of squares, which can be factored as:
   \[
   (p - 5m)(p + 5m) = 275
   \]

3. **Solving the Factored Equation:**
   We need to find pairs \((a, b)\) such that \(a \cdot b = 275\) and \(a = p - 5m\) and \(b = p + 5m\). The factor pairs of 275 are:
   \[
   (1, 275), (5, 55), (11, 25)
   \]
   We will check each pair to see if they yield integer solutions for \(m\) and \(p\).

   - For \((1, 275)\):
     \[
     p - 5m = 1 \quad \text{and} \quad p + 5m = 275
     \]
     Adding these equations:
     \[
     2p = 276 \implies p = 138
     \]
     Subtracting these equations:
     \[
     10m = 274 \implies m = 27.4 \quad (\text{not an integer})
     \]

   - For \((5, 55)\):
     \[
     p - 5m = 5 \quad \text{and} \quad p + 5m = 55
     \]
     Adding these equations:
     \[
     2p = 60 \implies p = 30
     \]
     Subtracting these equations:
     \[
     10m = 50 \implies m = 5 \quad (\text{an integer})
     \]
     Thus, \(m = 5\) and \(p = 30\).

   - For \((11, 25)\):
     \[
     p - 5m = 11 \quad \text{and} \quad p + 5m = 25
     \]
     Adding these equations:
     \[
     2p = 36 \implies p = 18
     \]
     Subtracting these equations:
     \[
     10m = 14 \implies m = 1.4 \quad (\text{not an integer})
     \]

4. **Conclusion:**
   The only integer solution is \(m = 5\). Substituting \(m = 5\) back into \(n = 5m^2\):
   \[
   n = 5(5^2) = 5 \cdot 25 = 125
   \]

The final answer is \(\boxed{125}\).