My solution: (algebra method)

1. let a be the umbrella, b be the cog and c be the pumpkin.

2. 3a = 18, so a = 6

3. a + 2c = 40, so 2c = 40 - 6 = 34, so c = 17

4. a + b + c = 37, so b + c = 37 - 6 = 31, b = 31 - 17 = 14

so, the umbrella = 6, the cog = 14 and the pumpkin = 17

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