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"Density bottle" is also called a specific gravity bottle, or pycnometer, which has a known capacity.
They come in different capacities. Common capacities are 2, 5, 10, 25, 50 ml.
The question does not specify the capacity, so an assumption is required. Assuming a 25 ml. capacity, then
net volume = 25 ml
net mass = 65-25 g = 40 g
Density = 40/25 g/ml = 1.6 g/ml
Note that the calculated density might change when the real capacity of the bottle is known.
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