Use the method of separation variable to solve Pde 2xdz/dx-3ydz/Dy=0

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

96 39 cause 135 -96=39 im smart (i used a calculater)

english maybe i can ..