diff --git a/solutions/day-1/datatypes.js b/solutions/day-1/datatypes.js
new file mode 100644
index 0000000..b2ffb74
--- /dev/null
+++ b/solutions/day-1/datatypes.js
@@ -0,0 +1,4 @@
+console.log(typeof('satya') );
+console.log(typeof(20) );
+console.log(typeof(null) );
+console.log(typeof(undefined) );
\ No newline at end of file
diff --git a/solutions/day-1/level.js b/solutions/day-1/level.js
index de88829..0f562af 100644
--- a/solutions/day-1/level.js
+++ b/solutions/day-1/level.js
@@ -1 +1,26 @@
-console.log("Hello World!");
\ No newline at end of file
+// 1.question
+     //Comments can make code readable
+// 2.question
+     //Welcome to 30DaysOfJavaScript
+// 3.question
+/*
+     Comments can make code readable,
+     easy to reuse and informative
+*/
+// 6.question
+let a, b, c, d;
+// 7.question
+let name = 'satya',
+     age = 20,
+     married = false,
+     id = 1;
+// 8.question 9.question
+let firstName = 'satya',
+     lastName = 'surendra',
+     maritalStatus = false,
+     country = 'Indian',
+     myage = 20;
+// 10.question
+let myAge = 20,
+     yourAge = 21;
+console.log(myAge,yourAge);
\ No newline at end of file
diff --git a/solutions/day-1/variable.js b/solutions/day-1/variable.js
new file mode 100644
index 0000000..3f6feaa
--- /dev/null
+++ b/solutions/day-1/variable.js
@@ -0,0 +1,4 @@
+let name = 'satya',
+     maritalStatus = false,
+     abc = undefined,
+     cbd = null;