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diff --git a/608/CH20/EX20.21/20_21.sce b/608/CH20/EX20.21/20_21.sce
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+//Problem 20.21: The output stage of an amplifier has an output resistance of 112 ohm. Calculate the optimum turns ratio of a transformer which would match a load resistance of 7 ohm to the output resistance of the amplifier.
+
+//initializing the variables:
+R1 = 112; // in Ohms
+RL = 7; // in Ohms
+
+//calculation:
+//The equivalent input resistance, R1 of the transformer needs to be 112 ohm for maximum power transfer.
+//R1 = RL*(tr^2)
+// tr = N1/N2 turn ratio
+tr = (R1/RL)^0.5
+
+printf("\n\n Result \n\n")
+printf("\n the optimum turns ratio is %.0f ", tr)
+\ No newline at end of file