diff --git a/src/books.js b/src/books.js
index c8119bb..ed10a2d 100644
--- a/src/books.js
+++ b/src/books.js
@@ -38,28 +38,66 @@
 
 
 // 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:
-
+function getBookDetails(book) {
+  return `${book.title} - ${book.author} - ${book.pages} pages`;
 }
 
 
 
 // Iteration 3 | Delete Language
 // Your code here:
-
-
+booksArray.forEach(book => {
+  delete book.details.language;
+});
 
 
 // Iteration 4 | Estimated Reading Time
 // Your code here:
 
+booksArray.forEach(book => {
+  book.readingTime = Math.ceil((book.pages * 500) / 90);
+});
+
 
 
 
@@ -86,15 +124,22 @@ const dictionary = {
     ],
 };
 
-function booksByAuthor() {
-  // Your code here:
-  
-}
+function booksByAuthor(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:
-  
-}
+function averagePageCount(books) {
+  const totalPages = books.reduce((sum, book) => sum + book.pages, 0);
+  return totalPages / books.length;
+}
\ No newline at end of file