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81+54x because 9 *9 = 81 and 9*6 is 54 and add the x to it and put it all together.

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