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+{
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "#1: Introduction"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "##Example number 1.1, Page number 1.4"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 9,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "ratio of Al is 37.18 *10**3\n",
+      "ratio of Mg is 30.9 *10**3\n",
+      "ratio of steel is 17.69 *10**3\n",
+      "ratio of glass is 25.55 *10**3\n",
+      "Aluminium alloy is the best material\n"
+     ]
+    }
+   ],
+   "source": [
+    "#importing modules\n",
+    "import math\n",
+    "from __future__ import division\n",
+    "\n",
+    "#Variable declaration\n",
+    "ws_al=103;     #working stress of Al\n",
+    "ws_mg=55;     #working stress of Mg\n",
+    "ws_st=138;     #working stress of steel\n",
+    "ws_g=35;     #working stress of glass\n",
+    "d_al=2770;   #density of Al\n",
+    "d_mg=1780;   #density of Mg\n",
+    "d_st=7800;   #density of steel\n",
+    "d_g=1370;   #density of glass\n",
+    "A=10**6;   #area\n",
+    "l=1;      #length\n",
+    "\n",
+    "#Calculation\n",
+    "L_al=ws_al*A;    #load of Al\n",
+    "L_mg=ws_mg*A;    #load of Mg\n",
+    "L_st=ws_st*A;    #load of steel\n",
+    "L_g=ws_g*A;    #load of glass\n",
+    "W_al=d_al*l;    #weight of Al\n",
+    "W_mg=d_mg*l;    #weight of Mg\n",
+    "W_st=d_st*l;    #weight of steel\n",
+    "W_g=d_g*l;    #weight of glass\n",
+    "r_al=L_al/W_al;     #ratio of Al\n",
+    "r_mg=L_mg/W_mg;     #ratio of Mg\n",
+    "r_st=L_st/W_st;     #ratio of steel\n",
+    "r_g=L_g/W_g;     #ratio of glass\n",
+    "\n",
+    "#Result\n",
+    "print \"ratio of Al is\",round(r_al/10**3,2),\"*10**3\"\n",
+    "print \"ratio of Mg is\",round(r_mg/10**3,2),\"*10**3\"\n",
+    "print \"ratio of steel is\",round(r_st/10**3,2),\"*10**3\"\n",
+    "print \"ratio of glass is\",round(r_g/10**3,2),\"*10**3\"\n",
+    "print \"Aluminium alloy is the best material\""
+   ]
+  }
+ ],
+ "metadata": {
+  "kernelspec": {
+   "display_name": "Python 2",
+   "language": "python",
+   "name": "python2"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 2
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython2",
+   "version": "2.7.9"
+  }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 0
+}