can you kindly show me the solution of this example

EXAMPLE (2) ON MATERIAL BALANCE WITH CHEMICAL REACTION The analysis of a flue gas, from a fuel gas containing no N2 has CO2:4.62%,CO:3.08%,O2:8.91% and N2:83.39%. Calculate (a)kmole of dry air supplied per kmole of dry flue gas (b) \% excess air (c)Analysis of the fuel gas which is a mixture of CH4 and C2H6