I'm looking over the summer work submissions, and it appears the one giving people the most trouble is #24, converting densities. They are tricky, mainly because you often have to deal with cubed units (for volume). A good working of a problem like the ones you see online is here. Just remember that you have to multiply a cubed unit by a conversion factor three times (or cube the factor) in order to cancel it.
Comments? Other questions?
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