in short, we simply split the total amount by the given ratio, so we'll split or divide 1020 by (15 + 2) and then distribute accordingly.

Sorry its hard to read and see
The next term of the series, 3, 10, 29, 66, 127 is 218.
He would need 24 more sales. 24 sales at $14.25 each = $342.
$342
+$375
-----------
$717
What a coincidence. I'm also learning this. (9th grade).
Thanks to the Corresponding Angles Postulate, y = 84.
And 84 + x = 180.
x = 96