What values of a, b and c are needed to balance the equation?
aC3H6 + bO2 6CO2 + cH2O

Answer:

3) 2, 6, 9

Carbon
3a = 6
Hence, a = 2

Hydrogen
6a = 2c
6 (2) = 2c
12 = 2c
c = 6

Oxygen
2b = 12 + c
2b = 12 + 6
2b = 18
b = 9