Pls help its weighted average

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

it is x equals 3   plese mark me really need it

step-by-step explanation:

- (2, -7)

- lines r and s and lines t and u must be parallel