This example draws together the previous snippets into a working implementation of the weighbridge.

The following is not a very sophisticated approach, because it does not allow for weight to accumulate: if we put a gold ingot into a paper bag, then put the bag on the balance platform, only the bag's weight will register. But it will do for a first try.

"Dimensions"
A length is a kind of value. 10m specifies a length. An area is a kind of value. 10 sq m specifies an area. A length times a length specifies an area.
A weight is a kind of value. 10kg specifies a weight. Everything has a weight.
The verb to weigh means the weight property. A thing usually weighs 1kg.
Definition: A thing is light if its weight is 3kg or less.
Definition: A thing is heavy if its weight is 10kg or more.
The Weighbridge is a room.
A blackboard is in the Weighbridge. "A blackboard propped against one wall reads: '122/10 is [122 divided by 10] remainder [remainder after dividing 122 by 10]; 122kg/10kg is [122kg divided by 10kg] remainder [remainder after dividing 122kg by 10kg]; 122kg/10 is [122kg divided by 10] remainder [remainder after dividing 122kg by 10].'" The blackboard weighs 10kg.
A feather and a lead pig are in the Weighbridge. The lead pig weighs 45kg.
The balance platform is a supporter in the Weighbridge. "The balance platform is 10m by 8m, giving it an area of [10m multiplied by 8m], currently weighing [the list of things on the platform]. The scale alongside reads: [total weight of things on the platform]. [if two things are on the platform]Average weight is: [the total weight of things on the platform divided by the number of things on the platform]. Heaviest item is [the heaviest thing on the platform], at [weight of the heaviest thing on the platform]. Lightest item is [the lightest thing on the platform], at [weight of the lightest thing on the platform].[otherwise]It seems to be able to weigh several things at once."
Test me with "get feather / put it on platform / look / get pig / put it on platform / look".
Test me with "get feather / put it on platform / look / get pig / put it on platform / look".
Weighbridge
A blackboard propped against one wall reads: "122/10 is 12 remainder 2; 122kg/10kg is 12 remainder 2kg; 122kg/10 is 12kg remainder 2kg."

The balance platform is 10m by 8m, giving it an area of 80 sq m, currently weighing nothing. The scale alongside reads: 0kg. It seems to be able to weigh several things at once.

You can also see a feather and a lead pig here.

>(Testing.)

>[1] get feather
Taken.

>[2] put it on platform
You put the feather on the balance platform.

>[3] look
Weighbridge
A blackboard propped against one wall reads: "122/10 is 12 remainder 2; 122kg/10kg is 12 remainder 2kg; 122kg/10 is 12kg remainder 2kg."

The balance platform is 10m by 8m, giving it an area of 80 sq m, currently weighing the feather. The scale alongside reads: 1kg. It seems to be able to weigh several things at once.

You can also see a lead pig here.

>[4] get pig
Taken.

>[5] put it on platform
You put the lead pig on the balance platform.

>[6] look
Weighbridge
A blackboard propped against one wall reads: "122/10 is 12 remainder 2; 122kg/10kg is 12 remainder 2kg; 122kg/10 is 12kg remainder 2kg."

The balance platform is 10m by 8m, giving it an area of 80 sq m, currently weighing the lead pig and the feather. The scale alongside reads: 46kg. Average weight is: 23kg. Heaviest item is the lead pig, at 45kg. Lightest item is the feather, at 1kg.