Solution

153694

First name
William Bailey
School
Little Melton Primary School
Country
Age
10
Email address
office@littlemelton.norfolk.sch.uk

The watermelon at the front weighs7.35kg.
The watermelon on the left weighs 8.20kg.
The watermelon on the right weighs 6.45kg.

7.35kg=7350g
8.20kg=8200g
6.45kg=6450g

Front: 7350g=7350 points
Left:.8200g=8200 points
Right: 6450g=6450 points

So the one at the front gets 7350 points.
The one on the left gets 8200 points.
The one on the right gets 6450 points.

So overall the watermelon on the left wins!