Your bedroom wall is 150 inches wide. You want to hang two posters, each 27 inches across, with an equal space between each poster and the wall edges. How many inches of space should you leave between the wall edge and each poster?
To find the amount of space that should be left between each poster and the wall edges, subtract the width of both posters from the width of the wall: 150 inches - (27 inches + 27 inches) = 150 inches - 54 inches = 96 inches.
Then, divide this remaining space equally between the two sides: 96 inches / 2 = <<96/2=48>>48 inches.
Therefore, you should leave 48 inches of space between each poster and the wall edge.