1405 is Introductory Chem rather than the General Chem 0f 1411. If you were going to medical school or were an engineering major, 1405 would do you no good at all. The way I'm reading the book so...
I believe that the question was set up as 6 1/2% of ____ = 25. OK..so let _____ = X and remember that 6 1/2% = .065 So... .065 * X = 25 X = 25/.065 X = 384.6154 Clear?