Q: Two substances of densities ρ1 and ρ2 are mixed in equal volume and their relative density is 4. When they are mixed in equal masses, relative density is 3. The values of ρ1 and ρ2 respectively are
(a)6, 2
(b)3, 5
(c)12, 4
(d)9, 3
Correct Answer: (a)
The correct answer is (b) '3, 5'. This question from the Geography domain tests knowledge of Population & Demography.