please tell how to do????

Dear Student,

Euler's polyhedron formula,

F+V=E+2
Where, F=Face=6
V=Vertex
E=Edge

So,
Given that 
E/V =3/2

​​​​​⇒E=1.5V

Now Using Euler's Polyhedron Formula,
F+V=E+2

⇒6+V=1.5V+2

⇒6-2=1.5V-V

⇒4=0.5V

⇒V=8

So,E=1.5V=1.5*8=12
So,
F=6
V=8
E=12


Regards