diff --git a/ex03.py b/ex03.py
index d0da21d..111bcac 100755
--- a/ex03.py
+++ b/ex03.py
@@ -21,3 +21,14 @@
 print("It is greater?", 5 > -2)
 print("It is greater or equal?", 5 >= -2)
 print("It is less or equal?", 5 <= -2)
+
+
+
+# Notice the math seems “wrong”? There are no fractions, only whole numbers. 
+# yes the maths is wrong. 
+# floating number i read.
+
+
+
+
+
diff --git a/ex04.py b/ex04.py
index 8e5e161..b8b20ea 100755
--- a/ex04.py
+++ b/ex04.py
@@ -13,3 +13,11 @@
 print("We can transport", carpool_capacity, "people today.")
 print("We have", passengers, "to carpool today.")
 print("We need to put about", average_passengers_per_car, "in each car.")
+
+# What do you mean by “read the file backward”?
+#Very simple. Imagine you have a fi le with 16 lines of code in it. Start at line 16, and compare it to
+# my file at line 16. Then do it again for 15, and so on, until you’ve read the whole fi le backward.
+
+#Why does / (divide) round down?
+#It’s not really rounding down; it’s just dropping the fractional part after the decimal. Try doing
+#7.0 / 4.0 and compare it to 7 / 4 and you’ll see the difference.
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diff --git a/ex11.py b/ex11.py
index 253a825..8cb48b0 100755
--- a/ex11.py
+++ b/ex11.py
@@ -6,3 +6,19 @@
 weight = input()
 
 print(f"So, you're {age} old, {height} tall and {weight} heavy.")
+
+
+# Below is the output where I gave input as string and number. 
+# input() take as string and then we have to convert it to integer but here we are not converting.
+
+# jas@jasmeen-E490:~$ /usr/bin/python3 /home/jas/Downloads/ex1.py
+# How old are you? two
+# How tall are you? two
+# How much do you weight? two
+# So, you're two old, two tall and two heavy.
+
+# jas@jasmeen-E490:~$ /usr/bin/python3 /home/jas/Downloads/ex1.py
+# How old are you? 33
+# How tall are you? 5.5
+# How much do you weight? 65
+# So, you're 33 old, 5.5 tall and 65 heavy.
diff --git a/ex13.py b/ex13.py
index 0f7981b..648435f 100755
--- a/ex13.py
+++ b/ex13.py
@@ -7,3 +7,39 @@
 print("Your first variable is:", first)
 print("Your second variable is:", second)
 print("Your third variable is:", third)
+
+# in below script, I dont understand how come ex1.py came in place of script. why not scripts
+
+# jas@jasmeen-E490:~/Downloads$ python3 ex1.py first second third
+# The script is called: ex1.py
+# Your first variable is: first
+# Your second variable is: second
+# Your third variable is: third
+
+#################################################################
+
+# in below script i tried giving argv as input from user but why the output is not number in line 43, 44, 45
+
+# from sys import argv
+
+
+# age = input("How old are you? ")
+# height = input("How tall are you? ")
+# weight = input("How much do you weight? ")
+
+
+# script, age, height, weight = argv
+
+# print("The script is called:", script)
+# print("Your age is:", age)
+# print("Your height  is:", height)
+# print("Your weight  is:", weight)
+
+# jas@jasmeen-E490:~/Downloads$ python3 ex1.py age height weight
+# How old are you? 33
+# How tall are you? 5.6
+# How much do you weight? 65
+# The script is called: ex1.py
+# Your age is: age
+# Your height  is: height
+# Your weight  is: weight
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