diff --git a/eating_cookies/eating_cookies.py b/eating_cookies/eating_cookies.py
index 62655d803..4c314c708 100644
--- a/eating_cookies/eating_cookies.py
+++ b/eating_cookies/eating_cookies.py
@@ -6,7 +6,19 @@
 # a solution that is more efficient than the naive 
 # recursive solution
 def eating_cookies(n, cache=None):
-  pass
+  if cache is None:
+    cache = [0 for i in range(n+1)]
+  if n < 0:
+    return 0
+  elif n >= 0 and n <= 1:
+    return 1
+  elif cache[n] != 0:
+    return cache[n]
+  else: 
+    answer = eating_cookies(n-1, cache) + eating_cookies(n-2, cache) + eating_cookies(n-3, cache)
+    cache[n] = answer
+    
+    return answer
 
 if __name__ == "__main__":
   if len(sys.argv) > 1:
diff --git a/recipe_batches/recipe_batches.py b/recipe_batches/recipe_batches.py
index c845950c5..d127f8530 100644
--- a/recipe_batches/recipe_batches.py
+++ b/recipe_batches/recipe_batches.py
@@ -3,8 +3,14 @@
 import math
 
 def recipe_batches(recipe, ingredients):
-  pass 
-
+  max_batch = 1000
+  for key, value in recipe.items():
+    if key not in ingredients.keys() or value > ingredients[key]:
+      return 0
+    pos_batch = math.floor(ingredients[key]/value)
+    if pos_batch < max_batch:
+      max_batch = pos_batch
+  return max_batch
 
 if __name__ == '__main__':
   # Change the entries of these dictionaries to test 
diff --git a/stock_prices/stock_prices.py b/stock_prices/stock_prices.py
index 9de20bc94..587c7d387 100644
--- a/stock_prices/stock_prices.py
+++ b/stock_prices/stock_prices.py
@@ -3,7 +3,16 @@
 import argparse
 
 def find_max_profit(prices):
-  pass
+  cur_min = prices[0]
+  cur_max_profit = prices[1] - prices[0]
+  for i, x in enumerate(prices[:-1]):
+    if cur_min > x:
+      cur_min = x
+      for y in prices[i+1:]:
+        profit = y - cur_min
+        if profit > cur_max_profit:
+          cur_max_profit = profit
+  return cur_max_profit
 
 
 if __name__ == '__main__':