ratio(molar) of H2:C = 0.75 -> Answer

Please help i've been trying to solve for a while.

3. A hydrocarbon fuel is burned with dry air in a furnace. The flue gas exits the furnace at a pressure of 115kPa with a dewpoint of 45C. The dry-basis analysis of the flue gas indicates 12 mole % carbon dioxide; the balance of the dry-basis analysis consists of oxygen and nitrogen. Determine the ratio of hydrogen to carbon in the fuel