Algebra Puzzle

Let's say that p=Pumpkin, u=Umbrella and a=Apple.

p+u+p=45

u+u+p=36

a+a+a=9

9÷3=3

a=3

p+u+a=30

u+u+a=21

p+p+a=39

p+p+a-a=39-3

=36

p+p=36

p=36÷2

=18

u+u+p-p=36-18

=18

u+u=18

u=18÷2

=9

Hence,

a=3

p=18

u=9