diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index 70ac307..5067183 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -40,60 +40,73 @@ 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) {
-        return false;
+        return nums.length != 0;
     }
 
     // 10. Use a conditional statement to return true if the provided string contains the word
     // "milk", or false if not
     // https://www.w3schools.com/java/java_ref_string.asp
     public boolean ten(String sentence) {
-        return false;
+        return sentence.contains("milk");
     }
 
     // 11. Use conditional statements to return the number 3 if the provided string contains
@@ -101,13 +114,22 @@ 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;
+        }
+        else { 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) {
-        return false;
+        return (num >= lower && num <= upper);
     }
 
     /*
@@ -123,6 +145,10 @@ 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..a7583c2 100644
--- a/src/main/java/com/booleanuk/extension/Extension.java
+++ b/src/main/java/com/booleanuk/extension/Extension.java
@@ -2,6 +2,8 @@
 
 import com.booleanuk.helpers.ExtensionBase;
 
+import java.lang.reflect.Array;
+
 public class Extension extends ExtensionBase {
     /*  1.
         We're going to improve our cake baking capabilities!
@@ -14,6 +16,12 @@ public class Extension extends ExtensionBase {
         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!"; }
+    }
+
 
 
 
@@ -27,7 +35,10 @@ public class Extension extends ExtensionBase {
         If a prep time of 0 is provided, the method should assume each ingredient takes 2 minutes to prepare.
      */
 
-
+    public int estimatePrepTime(String[] ing, int prepTime) {
+        int res = prepTime == 0 ? 2 : prepTime;
+        return ing.length * res;
+    }
 
     /*  3.
         Create a method named calculateGramsOfSugar that accepts two parameters:
@@ -41,7 +52,12 @@ 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[] ing, int layers){
+        boolean found = false;
+        for (int i = 0; i <= ing.length-1; i++){
+            if (ing[i].equals("sugar")) { found = true; break; }
+        }
+        if (found){ return 100*layers; }
+        else { return 0; }
+    }
 }