Answer:
19, 23, 28
Step-by-step explanation:
I used trial and error to figure it out. Not sure how to approach this problem otherwise.
19^2 = 361
23^2 = 529
28^2 = 784
The numbers 1-9 only appear once.
19 + 23 + 28 = 70.
And all 3 numbers are between 15 and 30.
