We can see that 60% of the students are male and 40% are female. Therefore 450 represents 40% of the total students who attend the college. This means 1% represents 11.25. Yes, I know, you can't have part of a person. But if you multiply this number by 100, you can see that you would get 1125. (Move the decimal two places to the right). Therefore 1125 total students attend the college. To check this, you can take 112.5 and multiply it by 4, which gives you 450, so your answer is correct. Also you can take 112.5 and multiply it by 6. Then add them and you will get 1125 students. Hope this helps! :D