Answer
23 classics watches and 12 plus watches.
Work Step by Step
We first write the word problem as an equation. Next, we solve the equation using substitution. Doing this, we find:
$$ x+y=35, 39.99x+59.99y=1639.65 \\ \frac{3999}{100}\left(35-y\right)+\frac{5999}{100}y=\frac{8198}{5} \\ y=12 \\ x=35-12=23 $$