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diff --git a/858/CH2/EX2.27/example_27.sce b/858/CH2/EX2.27/example_27.sce
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+++ b/858/CH2/EX2.27/example_27.sce
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+clc
+clear 
+printf("example 2.26 page number 80\n\n")
+
+m1 = 162   //mass of calcium bi carbonate in mg
+m2 = 73   //mass of magnesium bi carbonate in mg
+m3 = 136  // mass of calsium sulfate in mg
+m4 = 95   // mass of magnesium cloride
+m5 = 500  //mass of sodium cloride in mg
+m6 = 50   // mass of potassium cloride in mg
+
+content_1 = m1*100/m1;    //content of calcium bi carbonate in mg
+content_2 = m2*100/(2*m2);   //content of magnesium bi carbonate in mg
+content_3 = m3*100/m3;  // content of calsium sufate in mg
+content_4 = m4*100/m4;   // content of magnesium cloride
+
+//part_1
+
+temp_hardness = content_1 + content_2;   //depends on bicarbonate only
+total_hardness = content_1+content_2+content_3+content_4;
+printf("total hardness = %f\n temporary hardness = %f \n",temp_hardness,total_hardness)
+
+//part 2
+wt_lime = (74/100)*(content_1+2*content_2+content_4);
+actual_lime = wt_lime/0.85;
+printf("amount of lime required = %f \n",actual_lime)
+
+soda_required = (106/100)*(content_1+content_4);
+actual_soda = soda_required/0.98;
+printf("amount of soda required = %f \n",actual_soda)