###### Example3.3.12

In a certain class, a student's grade is calculated by the average of their scores on 3 tests. Aidan scored $$78\%$$ and $$54\%$$ on the first two tests. If he wants to earn at least a grade of C $$(70\%)\text{,}$$ what's the lowest score he needs to earn on the third exam?

Explanation
in-context