Let drum = a, car = b, cog = c
3a = 6
a = 6 ÷ 3 = 2
Therefore one drum = 2
2a + b = 20
2a = 2 x 2 = 4
20 - 4 = 16
Therefore one car = 16
2b + c = 36
2b = 2 x 16 = 32
36 - 32 = 4
Therefore one cog = 4
Ans: Drum = 2, Car = 16, Cog = 4
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