This question, because it is worded strangely, is asking for her salary before taxes. We can figure this out because we are given an expression, "(9/10)s", which represents what we want to find.
The equation would be either: (9/10)s = 486 or 0.9s = 486
To solve, you would divide 486 by 0.9, which gives you $540.
It would be a female teacher 3 out of 4 times, and male 1 out of 4. You could make a circle, divide it into quarters, make a spinner and likely get male once of four times.
