diff --git a/src/my_project/interviews/top_150_questions_round_20/sqrtx.py b/src/my_project/interviews/top_150_questions_round_20/sqrtx.py
new file mode 100644
index 00000000..b6b9c4f2
--- /dev/null
+++ b/src/my_project/interviews/top_150_questions_round_20/sqrtx.py
@@ -0,0 +1,20 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def mySqrt(self, x: int) -> int:
+
+        left, right = 0, x 
+
+        while left <= right:
+
+            mid = (left + right)//2
+
+            if mid**2 < x:
+                left = mid + 1
+            elif mid**2 > x:
+                right = mid - 1
+            else: 
+                return mid 
+            
+        return min(left, right)
\ No newline at end of file
diff --git a/tests/test_150_questions_round_20/test_sqrtx_round_20.py b/tests/test_150_questions_round_20/test_sqrtx_round_20.py
new file mode 100644
index 00000000..e69de29b