22. If two liquids of same volume but different densities

ρ₁ and ρ₂ are mixed, then density of mixture is given by

(a) ρ=  (ρ_{1 +}  ρ₂₎ /2                                      (b)  ρ=  (ρ_{1 +}  ρ₂₎ /(2 ρ₁ ρ_{2 )}

(c)  ρ=  (2 ρ₁ ρ_{2 )}  /  (ρ_{1 +}  ρ₂₎                     (d)  ρ=  ( ρ₁ ρ_{2 )}  /  (ρ_{1 +}  ρ₂₎

Answer-a