[tex]a + b + c = 19692 \\ \\ b = 3a + 6932 \\ \\ c = 2a + 12700 \\ \\ a + 3a + 6932 + 2a + 12700 = 19692 \\ \\ 6a = 19692 - 19632 \\ \\ a = 60 \div 6 \\ \\ a = 10 \\ \\ b = 3 \times 10 + 6932 \\ \\ b = 6962 \\ \\ c = 2 \times 10 + 12700 \\ \\ c = 12720[/tex]