Manipal Entrance Test 2013 Chemistry Paper

Following method of extracting Zn is based on thermodynamics
A:2‌ZnS+3O2 –––––🢖2‌ZnO+2SO2
B:ZnO+C –––––🢖‌Zn+CO
If ΔG°f (standard free energies of formation , in kJmol‌−1 ) of ZnS = - 205.4,
ZnO = -318.0, SO2 = -300.4 and of CO = -137.3
Free energy changes of the above reaction A and B (respectively) will be