Mixing two liquids with equal mass, find pressure

[look416]

Homework Statement

A mass of a liquid of density ρ is thoroughly mixed with an equal mass of another liquid of density 2ρ. No change of the total volume occurs.

Homework Equations

The Attempt at a Solution

i tried to use ρ=\frac{m}{v}
then v=\frac{m}{\rho}
therefore v1+v2=V
\frac{m}{\rho}+\frac{m}{2\rho}=v
\frac{3m}{2\rho}=V
\frac{3m}{2V}=\rho1
\rho1 \ \rho
in the end i get \rho1 = \frac{3}{2}\rho

but i was wrong couldn't find out the reason ><

 

[rl.bhat]

Total volume V = 3m/2ρ

Total mass = 2m

So new density ρ' = 2m/V = ...?

 

[look416]

oh no
!@#$%^&*()
=.=
cant think that this could be that simple ><
but anyway its the right answer
ths for solving it for me