Let $a$, $b$, and $c$ be real numbers such that $0\le a,b,c\le 5$ and $2a + b + c = 10$. Over all possible values of $a$, $b$, and $c$, determine the maximum possible value of $a + 2b + 3c$.

[i]Proposed by Andrew Wen[/i]
To find the maximum possible value of \(a + 2b + 3c\) given the constraints \(0 \le a, b, c \le 5\) and \(2a + b + c = 10\), we can use the method of Lagrange multipliers or analyze the boundary conditions.

1. **Set up the problem:**
   We need to maximize \(f(a, b, c) = a + 2b + 3c\) subject to the constraint \(g(a, b, c) = 2a + b + c - 10 = 0\).

2. **Using Lagrange multipliers:**
   Define the Lagrangian function:
   \[
   \mathcal{L}(a, b, c, \lambda) = a + 2b + 3c + \lambda (2a + b + c - 10)
   \]
   Take partial derivatives and set them to zero:
   \[
   \frac{\partial \mathcal{L}}{\partial a} = 1 + 2\lambda = 0 \implies \lambda = -\frac{1}{2}
   \]
   \[
   \frac{\partial \mathcal{L}}{\partial b} = 2 + \lambda = 0 \implies \lambda = -2
   \]
   \[
   \frac{\partial \mathcal{L}}{\partial c} = 3 + \lambda = 0 \implies \lambda = -3
   \]
   The values of \(\lambda\) are inconsistent, so we need to check the boundary conditions.

3. **Check boundary conditions:**
   Since \(0 \le a, b, c \le 5\), we need to check the values of \(a, b, c\) at the boundaries and within the constraints.

   - If \(a = 5\), then \(2(5) + b + c = 10 \implies b + c = 0\). Since \(b, c \ge 0\), the only solution is \(b = 0\) and \(c = 0\). Thus, \(a + 2b + 3c = 5\).
   - If \(b = 5\), then \(2a + 5 + c = 10 \implies 2a + c = 5\). We need to maximize \(a + 2(5) + 3c = a + 10 + 3c\). Since \(0 \le a \le 2.5\) and \(0 \le c \le 5\), we can set \(a = 2.5\) and \(c = 0\) to get \(a + 2b + 3c = 2.5 + 10 + 0 = 12.5\).
   - If \(c = 5\), then \(2a + b + 5 = 10 \implies 2a + b = 5\). We need to maximize \(a + 2b + 3(5) = a + 2b + 15\). Since \(0 \le a \le 2.5\) and \(0 \le b \le 5\), we can set \(a = 0\) and \(b = 5\) to get \(a + 2b + 3c = 0 + 10 + 15 = 25\).

4. **Conclusion:**
   The maximum value of \(a + 2b + 3c\) is achieved when \(a = 0\), \(b = 5\), and \(c = 5\).

The final answer is \(\boxed{25}\).