Question

AN EMPTY DENSITY BOTTLE WEIGHS 25GRAMS. IT WEIGHS 65GRAMS WHEN FILL WITH WATER. CALCULATE THE DENSITY OF THE LIQUID.

Answer 1

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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.

Answer 2

75 g - 30 g
= 45
Mass of water= 45 g

65 g - 30 g
= 35

Mass of liquid x = 35

Density = mass/volume
= 35/45
= 0.77 cm cube

Answer 3

yes