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+// Problem 3.20,Page no.68
+
+clc;clear;
+close;
+
+sigma=0.012 //strain
+P=150 //KN   //Total Load on the Post
+E=1.4*10**4 //N/mm**2 //modulus of elasticity
+//b be the width of the post in mm
+//2b is the longer dimension of the post in mm
+
+//Calculations
+
+//We know,
+//sigma=(P*(A*E)**-1) 
+
+//After substituting values and simplifying, we get
+b=((150*10**3)*(0.012*1.4*2*10**4)**-1)**0.5
+q=2*b //mm //Longer dimension of post
+
+//Result
+printf("Width of post is %.2f mm",b)
+printf("\n Longer dimension of post is %.2f mm",q)