@Orcio_Dojek

I still can't solve it, I can't do the system, I calculated the densities 1.1515, 0.3290, 0.1645 and how much it takes to burn 1 dm3, 0,526 for CO and H2 and 2,107 but it doesn't work. Can you solve it I need for the entrance test. Solution is 20 percent for H2, 30 percent for CH4 and 50 percent for CO