Hey twestern, analizing your answer for your own problem, I now understand, you're right. Damn it it was so easy! :p
Well, I can't help with derivatives...that's for university right?
And lestatdark, that's not the point of the exercise. You did that using a calculator, and the problem is to be solved with mathematical skills. However, I believe you got the answers right, at least I know 2 of them are right.
I'll try solving the problem again and I'll post the answer soon. For the meantime, here's another problem to keep you guys entertained.
A cage contained 100 fruits between apples and oranges. After a few days, some fruits got ripped. When the cage was opened, it was observed that of the fruits that were good, the eleventh part was oranges; and the fifth part of the ripped fruits were apples. Then the ammount of the ripped fruits is: ?
And that's the problem. Please, spare me the grammatical mistakes since english is not my first language and the problem was originally in spanish. ;)
