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diff --git a/3683/CH4/EX4.7/Ex4_7.sce b/3683/CH4/EX4.7/Ex4_7.sce
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+D=100//thickness of slab, in mm
+l=3//span of slab, in m
+s=0.23//thickness of support, in m
+Lef=l+s//effective span, in m
+W=5//UDL, in kN/m
+cover=15//in mm
+R=W*Lef/2//in kN
+M=(R*s/2-W*s^2/2)*10^6//bending moment at face of wall, in N-mm
+//10 mm dia bars at 145 mm c/c as main steel
+dia=10//in mm
+c=145//spacing of reinforcement, in mm
+Ast=1000*0.785*dia^2/c//in sq mm
+//as alternate bars are bent up
+Ast=Ast/2//available steel reinforcement at face of wall, in sq mm
+d=D-10/2-cover//in mm
+//assuming balanced section
+z=0.87*d//in mm
+sigma_st=M/(Ast*z)//in MPa
+Tbd=0.6//bond stress, in MPa
+Ld=dia*sigma_st/(4*Tbd)//in mm
+Ld=177//round-off, in mm
+mprintf("Development length required from the face of the support = %d mm",Ld)
+//answer given in textbook is incorrect