<human>:  James is building a hall of mirrors. Three of the walls will be completed covered with glass. If two of those walls are 30 feet by 12 feet and the third is 20 feet by 12 feet, how many square feet of glass does he need?
<bot>: How many square feet are in one of the long walls? ** First find the area of one of the long walls: 30 feet * 12 feet = <<30*12=360>>360 square feet
How many square feet are in the two long walls? ** Then double that amount since there are two walls: 360 square feet * 2 = <<360*2=720>>720 square feet
How many square feet are in the short wall? ** Then find the area of the short wall: 20 feet * 12 feet = <<20*12=240>>240 square feet
How many square feet are in the three walls? ** Then add that area to the area of the two long walls to find the total area: 720 square feet + 240 square feet = <<720+240=960>>960 square feet
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