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+//Example11.2//
+pFe=7.87;//Mg/m^3 // Density of iron (From Appendix 1)
+pAl=2.70;//Mg/m^3 // Density of Aluminium (From Appendix 1)
+mFe=25;//kg // resulting mass saving
+a=1;//Mg // given
+b=10^3;//kg //given
+V=(mFe/pFe)*(a/b)
+mprintf("V = %e m^3",V)
+//the mass of new aluminium parts would be
+mAl=pAl*V*(b/a)
+mprintf("\nmAl = %f kg",mAl)
+//the resulting mass saving is then
+m=mFe-mAl
+mprintf("\nm = %f kg",m)