diff --git a/bin/main/com/booleanuk/core/Exercise.class b/bin/main/com/booleanuk/core/Exercise.class
new file mode 100644
index 0000000..d3136b4
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diff --git a/bin/main/com/booleanuk/extension/Extension.class b/bin/main/com/booleanuk/extension/Extension.class
new file mode 100644
index 0000000..6eafd4c
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diff --git a/bin/main/com/booleanuk/helpers/ExtensionBase.class b/bin/main/com/booleanuk/helpers/ExtensionBase.class
new file mode 100644
index 0000000..8f385a9
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diff --git a/bin/test/com/booleanuk/core/ExerciseTest.class b/bin/test/com/booleanuk/core/ExerciseTest.class
new file mode 100644
index 0000000..86720a0
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diff --git a/bin/test/com/booleanuk/extension/ExtensionTest.class b/bin/test/com/booleanuk/extension/ExtensionTest.class
new file mode 100644
index 0000000..05cd474
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diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 70ac307..01d4184 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -40,52 +40,67 @@ public String sayGoodMorning(boolean isMorning) {
     // 1. What will the returned value be if I run sayGoodMorning(false)?
     // Change the returned value in the method below to your answer. It is case-sensitive.
     public String one() {
-        return "";
+        return "Good day!";
     }
 
     // 2. What will the output be if I run sayGoodMorning(true)?
     // Change the returned value in the method below to your answer. It is case-sensitive.
     public String two() {
-        return "";
+        return "Good morning!";
     }
 
     // 3. What will the output be if I run sayGoodMorning("Hello".equals("Hello"))?
     // Change the returned value in the method below to your answer. It is case-sensitive.
     public String three() {
-        return "";
+        return "Good morning!";
     }
 
     // 4. What will the output be if I run sayGoodMorning(!"A word".equals("Another word"))
     public String four() {
-        return "";
+        return "Good morning!";
     }
 
     // 5. What will the output be if I run sayGoodMorning(25 != 25)
     public String five() {
-        return "";
+        return "Good day!";
     }
 
     // 6. Use a conditional statement to return "Correct!" if the input is more than 7
     // or "Wrong!" if not
     public String six(int num) {
-        return "Not implemented yet!";
+        if (num > 7) {
+            return "Correct!";
+        } else {
+            return "Wrong!";
+        }
     }
 
     // 7. Use a conditional statement to return "Correct!" if the input is false
     // or "Wrong!" if not
     public String seven(boolean bool) {
-        return "Not implemented yet!";
+        if (bool) {
+            return "Wrong!";
+        } else {
+            return "Correct!";
+        }
     }
 
     // 8. Use a conditional statement to return "Correct!" if numOne is more than or equal to numTwo
     // or "Wrong!" if not
     public String eight(int numOne, int numTwo) {
-        return "Not implemented yet!";
+        if (numOne >= numTwo) {
+            return "Correct!";
+        } else {
+            return "Wrong!";
+        }
     }
 
     // 9. Use a conditional statement to return true if the array provided is not empty
     // or false if it is empty
     public boolean nine(int[] nums) {
+        if (nums.length > 0) {
+            return true;
+        }
         return false;
     }
 
@@ -93,6 +108,8 @@ public boolean nine(int[] nums) {
     // "milk", or false if not
     // https://www.w3schools.com/java/java_ref_string.asp
     public boolean ten(String sentence) {
+        if (sentence.contains("milk"))
+            return true;
         return false;
     }
 
@@ -101,12 +118,22 @@ public boolean ten(String sentence) {
     // Return the number 9 if the string contains both coffee and milk.
     // Otherwise, return the number 0.
     public int eleven(String sentence) {
-        return -1;
+        if (sentence.contains("milk") && sentence.contains("coffee")) {
+            return 9;
+        } else if (sentence.contains("coffee")) {
+            return 6;
+        } else if (sentence.contains("milk")) {
+            return 3;
+        }
+        return 0;
     }
 
     // 12. Use conditional statements to return true if num is more than or equal to lower and is
     // less than or equal to upper, otherwise return false.
     public boolean twelve(int num, int lower, int upper) {
+        if (num >= lower && num <= upper)
+            return true;
+
         return false;
     }
 
@@ -123,6 +150,16 @@ public boolean twelve(int num, int lower, int upper) {
         20+     | Adult
      */
     public String thirteen(int age) {
-        return "Not implemented yet!";
+        if (age <= 0) {
+            return "Baby";
+        } else if (age >= 1 && age <= 4) {
+            return "Toddler";
+        } else if (age >= 5 && age <= 12) {
+            return "Child";
+        } else if (age >= 13 && age <= 19) {
+            return "Teenager";
+        } else {
+            return "Adult";
+        }
     }
 }
diff --git a/src/main/java/com/booleanuk/extension/Extension.java b/src/main/java/com/booleanuk/extension/Extension.java
index 44e540f..d5a4a3c 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -13,6 +13,15 @@ public class Extension extends ExtensionBase {
         "The cake is still baking!" if there are any remaining minutes left,
         and "The timer finished ages ago!" if the remaining minutes is a negative number
      */
+    public String timerStatus(int timeLeft) {
+        if (timeLeft == 0) {
+            return "The cake is ready!";
+        } else if (timeLeft < 0) {
+            return "The timer finished ages ago!";
+        } else {
+            return "The cake is still baking!";
+        }
+    }
 
 
 
@@ -26,6 +35,13 @@ public class Extension extends ExtensionBase {
         provided and the prep time per ingredient.
         If a prep time of 0 is provided, the method should assume each ingredient takes 2 minutes to prepare.
      */
+    public int estimatePrepTime(String[] ingredients, int prepTime) {
+        if (prepTime == 0) {
+            prepTime = 2;
+        }
+
+        return ingredients.length * prepTime;
+    }
 
 
 
@@ -40,6 +56,14 @@ public class Extension extends ExtensionBase {
 
         You may need to use programming techniques we have yet to cover in the course to solve this task.
      */
+    public int calculateGramsOfSugar(String[] ingredients, int layers) {
+        for (String s : ingredients) {
+            if (s == "sugar") {
+                return 100 * layers;
+            }
+        }
+        return 0;
+    }