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If you use the factor-label method( http://en.wikipedia.org/wiki/Units_conversion_by_factor-label ) on this type of problem, the units make sense and the solution becomes obvious. Density is units of mass divided by units of volume Therefore, Mass = Density x volume 0.15 grams 240 cm^3 ────── x ──────── = 36 grams cm^3 When the bun is squashed, its mass does not change so the following equation works: Squashed density = Mass ÷ squashed volume I will leave the calculator work to you.
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