initial commit / add all books

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+//Variable declaration:
+R1_in = 10000                   //Rate of fuel fed into the boiler (lb/h)
+R2_1n = 20000                   //Rate of air fed into the boiler (lb/h)
+R3_in = 2000                    //Rate of methane fed into the boiler (lb/h)
+
+//Calculations:
+m_in = R1_in + R2_1n + R3_in    //Rate of mass in (lb/h)
+m_out = m_in                    //Rate of mass out (lb/h)
+
+//Result:
+printf ("The rate of the product gases exit from the incinerator is : %.0f lb/h",m_in)