Question

An empty graduated cylinder has a mass of 𝟓𝟎 grams. The cylinder has a mass of 𝟏𝟐𝟎 grams when 𝟑𝟎 milliliters of water is poured into it. When a rock is added to the graduated cylinder, the water level rises to 𝟕𝟓 milliliters and the mass is 𝟐𝟓𝟎 grams. Determine the density of the rock.
the mass of the rock is the increase of total cylinder, water, rock mass when the rock was added
250 grams - 120 grams = 130 grams of rock
the rock volume = 75ml - 30 ml = 45 ml
so the rock density = 130/45 = 2.89 grams/ milliliter

nuts

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