Look at these scales. 

The mass of each of the small boxes is 1kg. Calculate the mass of each of the large boxes.

We want to find something that we can do to both sides which will leave just one large box on the left-hand side. We cannot take two large boxes from both sides as there are not two to take from the right-hand side. We can divide both sides by 3. This leaves:

Transcribed Image Text:

AHE 1kg 1kg 1kg 1kg 1kg| 1kg