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diff --git a/2966/CH1/EX1.3.9/1_3_9.sce b/2966/CH1/EX1.3.9/1_3_9.sce
new file mode 100644
index 000000000..1eded4e6d
--- /dev/null
+++ b/2966/CH1/EX1.3.9/1_3_9.sce
@@ -0,0 +1,11 @@
+//water//
+//page 1.9 example 3//
+clc
+W1=150;//Ca2+ in water in mg/L//
+W2=60;//Mg2+ in water in mg/L//
+M1=100/40;//multiplication factor of Ca2+//
+M2=100/24;//multiplication factor of Mg2+//
+P1=W1*M1;//Ca2+ in terms of CaCO3//
+P2=W2*M2;//Mg2+ in terms of CaCO3//
+T=P1+P2;
+printf("\nTotal hardness is %.0f mg/L",T);
+\ No newline at end of file