![enter image description here](https://i.stack.imgur.com/r9tfI.jpg)

> 
> If $g=10 N/kg$ , what will show the Scales?
> 
> 
> Yes, I know this is a very simple problem. But, I am stuck.
> $$P=mg \Rightarrow m=\frac{100N+100N}{10N/kg}=20 kg .$$
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> 

But, I'm worried about this answer. What's the difference between hand holding the scales and putting them on the table? I think, if the Scales is captured manually, the force applied from above should be meaningless. And answer must be $m=10 kg.$ Is it correct?