Re: 2012 HSC Mathematics Marathon!
Haha Spiral, did you get this from Cambridge? I swear I did this question before in max/min problems :O
EDIT:
I don't get Q 4...
SC will be replaced with your school's own examinations; which is worse because SC made lessons pretty much bludge. It is also extremely difficult to achieve a Band 6 in Standard in comparison to Advanced.
To investigate what condition other than the refrigerator [Indoor, Outdoor, Indoor in water, Outdoor in water] best suits the storage of citric and non-citric fruits in the summer season. I got full marks for mine, but it was a long process...