What is the total mass?
The diagram below represents a portion of a triple-beam balance.

The correct answer is 545.20 g.
From this triple beam balance we can determine what the scale represents.

The first beam balance shows a scale of 500.
The second beam balance shows a figure of 40g
The third beam balance shows a figure of 5.2g
The total figure = 500 + 40 + 5.2
= 545.20g
Hope this helps.