diff --git a/src/books.js b/src/books.js
index c8119bb..fbaea31 100644
--- a/src/books.js
+++ b/src/books.js
@@ -38,27 +38,82 @@
 
 
 // Your code here:
-const booksArray = [];
+const booksArray = [
+  {
+    title: "The Old Man and the Sea",
+    pages: 128,
+    author: "Ernest Hemingway",
+    details: {
+      language: "English",
+      description: "One of Hemingway's most famous works, it tells the story of Santiago..."
+    }
+  },
+  {
+    title: "The Airbnb Story",
+    pages: 256,
+    author: "Leight Gallagher",
+    details: {
+      language: "English",
+      description: "This is the remarkable behind-the-scenes story of the creation and growth of Airbnb..."
+    }
+  },
+  {
+    title: "Educated - A Memoir",
+    pages: 352,
+    author: "Tara Westover",
+    details: {
+      language: "English",
+      description: "Educated is an account of the struggle for self-invention..."
+    }
+  },
+  {
+    title: "The Art of Learning",
+    pages: 288,
+    author: "Josh Waitzkin",
+    details: {
+      language: "English",
+      description: "The Art of Learning takes readers through Waitzkin's unique journey to excellence. He explains in clear detail how a well-thought-out, principled approach to learning is what separates success from failure."
+    }
+  }
+];
 
 
 
 
 // Iteration 2 | Book Details
 function getBookDetails() {
-  // Your code here:
-
+  // Returns string: "TITLE - AUTHOR - PAGES pages"
+  // Accepts a book object as argument
+  return function(book) {
+    return `${book.title} - ${book.author} - ${book.pages} pages`;
+  };
 }
 
 
 
 // Iteration 3 | Delete Language
-// Your code here:
+
+// Delete the 'language' property from each book's details
+booksArray.forEach(book => {
+  if (book.details && book.details.language) {
+    delete book.details.language;
+  }
+});
+// Confirm deletion
+console.log(booksArray);
 
 
 
 
 // Iteration 4 | Estimated Reading Time
-// Your code here:
+
+// Add readingTime property to each book
+booksArray.forEach(book => {
+  const readingTime = Math.ceil((book.pages * 500) / 90);
+  book.readingTime = readingTime;
+});
+// Confirm addition
+console.log(booksArray);
 
 
 
@@ -87,14 +142,27 @@ const dictionary = {
 };
 
 function booksByAuthor() {
-  // Your code here:
-  
+  // Returns an array of book objects from a dictionary
+  return function(dictionary) {
+    const result = [];
+    for (const author in dictionary) {
+      const books = dictionary[author];
+      books.forEach(([title, pages]) => {
+        result.push({ title, pages, author });
+      });
+    }
+    return result;
+  };
 }
 
 
 
 // Bonus: Iteration 6 | Average Page Count
 function averagePageCount() {
-  // Your code here:
-  
+  // Returns the average page count of all books in the array
+  return function(books) {
+    if (!books.length) return 0;
+    const total = books.reduce((sum, book) => sum + book.pages, 0);
+    return total / books.length;
+  };
 }