y = 4x.
Step-by-step explanation:
That is what I believe the y is.
hope this helps.
I am terribly sorry if I am wrong.
it will cost dollar $540
the living room is 3 which means if we divide 325/3 then we get $108
therefore if 1part of the living room cost $108 and 3 costed $325
then total 5part of the room will cost 5*108 which gives $540