Update lasagna.py

Author: Haubilau

exercises/concept/guidos-gorgeous-lasagna/lasagna.py

@@ -9,10 +9,10 @@
 
 
 #TODO: define your EXPECTED_BAKE_TIME (required) and PREPARATION_TIME (optional) constants below.
-
+EXPECTED_BAKE_TIME = 40
 
 #TODO: Remove 'pass' and complete the 'bake_time_remaining()' function below.
-def bake_time_remaining():
+def bake_time_remaining(n):
     """Calculate the bake time remaining.
 
     :param elapsed_bake_time: int - baking time already elapsed.
@@ -23,18 +23,25 @@ def bake_time_remaining():
     based on the `EXPECTED_BAKE_TIME`.
     """
 
-    pass
+    return EXPECTED_BAKE_TIME-n
 
 
 #TODO: Define the 'preparation_time_in_minutes()' function below.
 # To avoid the use of magic numbers (see: https://en.wikipedia.org/wiki/Magic_number_(programming)), you should define a PREPARATION_TIME constant.
 # You can do that on the line below the 'EXPECTED_BAKE_TIME' constant.
 # This will make it easier to do calculations, and make changes to your code.
-
-
+PREPARATION_TIME = 2
+def preparation_time_in_minutes(layer):
+    """ 
+    calculates prepration time
+    """
+    return layer*PREPARATION_TIME
+    
 
 #TODO: define the 'elapsed_time_in_minutes()' function below.
-
+def elapsed_time_in_minutes(number_of_layers, elapsed_bake_time):
+    """ calculates the elaped total time"""
+    return number_of_layers*PREPARATION_TIME+elapsed_bake_time
 
 
 # TODO: Remember to go back and add docstrings to all your functions