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diff --git a/213/CH11/EX11.20/11_20.sce b/213/CH11/EX11.20/11_20.sce
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+//To find number of ropes required
+clc
+//Given:
+P=600 //kW
+d=4 //m
+N=90 //rpm
+theta=160*%pi/180 //radians
+funcprot(0)
+beta=45/2 //degrees
+mu=0.28
+m=1.5 //kg/m
+T=2400 //N
+//Solution:
+//Calculating the velocity of the rope
+v=%pi*d*N/60 //m/s
+//Calculating the centrifugal tension
+TC=m*v^2 //N
+//Calculating the tension in the tight side of the rope
+T1=T-TC //N
+//Calculating the tension in the slack side of the belt
+T2=T1/exp(mu*theta*(1/sind(beta))) //N
+//Calculating the power transmitted per rope
+P1=(T1-T2)*v/1000 //Power transmitted per rope, kW
+//Calculating the number of ropes
+n=P/P1 //Number of ropes
+//Results:
+printf("\n\n Number of ropes required = %d.\n\n",n+1)
+\ No newline at end of file