<human>:  Jason and Jeremy want to paint their wall white and agreed to split the cost of the paint. A gallon of paint costs $45 and can cover up to 400 square feet. How much will each of them contribute to the cost of the paint if their walls have a total area of 1600 square feet and will need a second coat?
<bot>: How many gallons of paint will they need? ** They need 1600 square feet / 400 square feet/gallon = <<1600/400=4>>4 gallons of paint for their walls.
How many gallons of paint will they need in total? ** Since they will do a second coating, then they would need 4 gallons x 2 = <<4*2=8>>8 gallons in all.
How much will the paint cost in total? ** Eight gallons of paint will cost $45/gallon x 8 gallons = $<<45*8=360>>360.
How much will each of them contribute to the cost of the paint? ** Thus, Jason and Jeremy will each contribute $360/2 = $<<360/2=180>>180.
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