The table below gives the mass and volume of three objects (P, Q and R).

P Q R

Mass in grams 4 8 6

Volume in cm³ 1 10 3

Which statement about the densities of these three objects is correct?
(a) Q is denser than P.
(b) P is denser than R.
(c) P and R have equal densities.
(d) Q and R have equal densities.

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Solution

The table below gives the mass and volume of three objects (P, Q and R). We can calculate their density using the formula 'Density = Mass / Volume'.

P Q R

Mass in grams 4 8 6

Volume in cm³ 1 10 3

Density in g/cm³ 4/1=4 8/10=0.8
6/3=2

The statements about the densities of these three objects are as follows.
(a) Q is denser than P - False
(b) P is denser than R - True
(c) P and R have equal densities - False
(d) Q and R have equal densities - False

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	P	Q	R
Mass in grams	4	8	6
Volume in cm³	1	10	3
Density in g/cm³	4/1=4	8/10=0.8	6/3=2