diff --git a/src/main/java/com/booleanuk/core/Exercise.java b/src/main/java/com/booleanuk/core/Exercise.java
index d31a45c..caa7620 100644
--- a/src/main/java/com/booleanuk/core/Exercise.java
+++ b/src/main/java/com/booleanuk/core/Exercise.java
@@ -44,7 +44,9 @@ public ArrayList<Integer> getFavouriteNumbers() {
            second number contained in the list that is returned from getFavouriteNumbers
      */
 
-
+    public int getSecondNumber() {
+        return getFavouriteNumbers().get(1);
+    }
 
     /*
         TODO: 2. Create a method named multiply that accepts two parameters in this order:
@@ -56,7 +58,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          https://www.programiz.com/java-programming/library/arraylist/replaceall
      */
 
-
+    public ArrayList<Integer> multiply(ArrayList<Integer> ns, int n) {
+        ns.replaceAll((Integer i) -> i * n);
+        return ns;
+    }
 
     /*
         TODO: 3. Create a method named isEmpty that accepts one parameter:
@@ -64,7 +69,9 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must return a boolean that indicates whether the provided list is empty or not
      */
 
-
+    public boolean isEmpty(ArrayList<String> strings) {
+        return strings.isEmpty();
+    }
 
     /*
         TODO: 4. Create a method named addIngredient that accepts two parameters in this order:
@@ -73,7 +80,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must add the second parameter into the list provided and then return the list
      */
 
-
+    public ArrayList<String> addIngredient(ArrayList<String> strings, String s) {
+        strings.add(s);
+        return strings;
+    }
 
     /*
         TODO: 5. Create a method named removeIngredient that accepts two parameters in this order:
@@ -82,7 +92,10 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must remove the second parameter from the list and then return the list
      */
 
-
+    public ArrayList<String> removeIngredient(ArrayList<String> strings, String s) {
+        strings.remove(s);
+        return strings;
+    }
 
     /*
         TODO: 6. Create a method named containsIngredient that accepts two parameters in this order:
@@ -91,6 +104,8 @@ public ArrayList<Integer> getFavouriteNumbers() {
          The method must return a boolean that indicates whether the second parameter exists in the provided list
      */
 
-
+    public boolean containsIngredient(ArrayList<String> strings, String s) {
+        return strings.contains(s);
+    }
 
 }