Maths Algebra Puzzle

3 clocks = 30
Therefore, 1 clock represents 10

1 clock + 2 drums = 40
Since 1 clock represents 10
10 + 2 drums = 40
Therefore, 1 drum represents 15

2 drums + 1 pumpkin = 44
30 + 1 pumpkin = 44
Therefore, 1 pumpkin represents 14