Create solver_mixture.py

solver_mixture.py

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+from __future__ import annotations
+
+import re
+from typing import Optional
+
+from models import SolverResult
+
+
+def solve_mixture(text: str) -> Optional[SolverResult]:
+
+    lower = text.lower()
+
+    if "mixture" not in lower and "solution" not in lower and "%" not in lower:
+        return None
+
+    nums = [float(x) for x in re.findall(r"\d+(?:\.\d+)?", lower)]
+
+    if len(nums) < 3:
+        return None
+
+    p1 = nums[0] / 100
+    p2 = nums[1] / 100
+    target = nums[2] / 100
+
+    if p1 == p2:
+        return None
+
+    ratio = (target - p2) / (p1 - target)
+
+    if ratio <= 0:
+        return None
+
+    return SolverResult(
+        domain="quant",
+        solved=True,
+        topic="mixture",
+        answer_value=f"{ratio:g}",
+        internal_answer=f"{ratio:g}",
+        steps=[
+            "Use the mixture equation.",
+            "Set up the weighted average of concentrations.",
+            "Solve for the ratio of quantities."
+        ]
+    )