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When giving the answers it becomes automatic because one learns hte nature of various scales and triads. So, you really only need to "see" the scale mentally and plug in the triads. In a way, its almost learned and memorized.
The benefit to these exercises is that you begin to understand the relationship between triads and scales. It will be useful in expanding you ability to use harmonies when applying counterpoing, to suggest keys, use surpise or jarring modulations. As you already mentioned, it is forcing you to really get a better understanding on constructing scales and being at home with them. Of course this idea and techinique has a stronger application in a more tonal setting but can be useful in a less tonal work as well.
Now for the answers:
1) A minor - 1 error
2) D diminished - missing keys
3) Correct
4) Correct
5) Correct
6) Gb Major - 1 error
7) Correct
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