diff --git a/ch3/variables/Cargo.lock b/ch3/variables/Cargo.lock
new file mode 100644
index 0000000..f26e54f
--- /dev/null
+++ b/ch3/variables/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "variables"
+version = "0.1.0"
diff --git a/ch3/variables/Cargo.toml b/ch3/variables/Cargo.toml
new file mode 100644
index 0000000..c093eb6
--- /dev/null
+++ b/ch3/variables/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "variables"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
diff --git a/ch3/variables/src/main.rs b/ch3/variables/src/main.rs
new file mode 100644
index 0000000..a57709c
--- /dev/null
+++ b/ch3/variables/src/main.rs
@@ -0,0 +1,6 @@
+fn main() {
+    let mut x = 5;
+    println!("The value of x is: {x}");
+    x = 6;
+    println!("The value of x is: {x}");
+}