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diff --git a/1985/CH6/EX6.4/Chapter6_Example4.sce b/1985/CH6/EX6.4/Chapter6_Example4.sce
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+++ b/1985/CH6/EX6.4/Chapter6_Example4.sce
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+clc
+clear
+//Input data
+t1=30//Exposure time in s
+d1=5.6//Lens aperture 
+d2=8//Lens aperture
+
+//Calculations
+f=1/2//The squares of the f-number are in the ratio 1:2
+t2=(1/f)*t1//Exposure time in s
+
+//Output
+printf('The time of exposure is %3.0f s when the print is made with a lens aperture of %i',t2,d2)