Hi Stacey/Ron, I have a problem with the following statement: .72x + .80y = .75(x+y) .72x + .80y = .75x + .75y Please refer to this thread of a similar GMATPrep problem: http://www.manhattangmat.com/forums/female-students-at-college-c-ds-t13977.html In that problem, choice B was wrong because we und...