First find the screen area of Bill's TV: 48 inches * 100 inches = <<48*100=4800>>4800 square inches

Then find the screen area of Bob's TV: 70 inches * 60 inches = <<70*60=4200>>4200 square inches

Then subtract the size of the smaller TV from the size of the bigger TV to find the size difference: 4800 square inches - 4200 square inches = <<4800-4200=600>>600 square inches

Then multiply the size difference by the weight per square inch to find the weight difference: 600 square inches * 4 oz/square inch = <<600*4=2400>>2400 oz

Then divide the weight difference in ounces by the number of ounces per pound to find the weight difference in pounds: 2400 oz / 16 oz/pound = <<2400/16=150>>150 pounds

# Answer

150
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Bill gets a flat-screen TV that measures 48 inches by 100 inches. His brother Bob gets a TV that measures 70 inches by 60 inches. If the TVs weigh 4 oz per square inch of screen space, how much more does the heavier TV weigh in pounds? (There are 16 ounces per pound).
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
150
Bill gets a flat-screen TV that measures 48 inches by 100 inches. His brother Bob gets a TV that measures 70 inches by 60 inches. If the TVs weigh 4 oz per square inch of screen space, how much more does the heavier TV weigh in pounds? (There are 16 ounces per pound).
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