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diff --git a/3159/CH7/EX7.3/Ex7_3.sce b/3159/CH7/EX7.3/Ex7_3.sce
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+// Calculate amount of pure water that can be extracted from sea water
+clc
+L = 23.3 // % composition of L
+a = 3.5 // concentration of Nacl in sea water
+ice = 0 // % composition of ice
+printf("\n Example 7.3")
+f_ice = (L-a)/(L-ice)
+printf("\n Fractional amount of pure water that can be extracted from sea water is %0.2f",f_ice)
diff --git a/3159/CH7/EX7.3/Ex7_3.txt b/3159/CH7/EX7.3/Ex7_3.txt
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+ 
+ Example 7.3
+ Fractional amount of pure water that can be extracted from sea water is 0.85 
+\ No newline at end of file