Here's an Algebra 1-level question from the SAT—no not that SAT, but the Samsung Aptitude Test, which you can learn more about by reading this article (hat tip to Chelsea on Twitter for the link). It took me about a minute (OK, maybe a bit more) to get the answer.
The number of male employees decreased by 10% compared to the previous year. The number of female employees increased by 15%. There are currently a total of 182 employees at the company. If there were 20 more male employees than female employees last year, how many female employees are at the company this year?
Enjoy. Leave your answer in the comments. Feel free to discuss how you figured it out.