net reaction of the reaction series

Question

What is the net reaction of the reaction series below? 



3 CO2(g) + 4 H2O(g) -----> C3H8(g) + 5 O2(g)

3 C(s) + 3 O2(g) -----> 3 CO2(g)

4 H2(g) + 2 O2(g) -----> 4 H2O(g)

Answer 1

3 CO2(g) + 4 H2O(g) -----> C3H8(g) + 5 O2(g)

3 C(s) + 3 O2(g) -----> 3 CO2(g)

4 H2(g) + 2 O2(g) -----> 4 H2O(g)