The county fair was hosting a pumpkin contest to see who could grow the biggest pumpkin in pounds.  Brad entered his pumpkin with a weight of 54 pounds.  Jessica's was half the weight of Brad's.  Betty's pumpkin weight 4 times the amount of Jessica's pumpkin.  What is the difference between the heaviest and lightest pumpkin in  pounds?
Jessica's pumpkin weighs half the weight of Brad's 54-pound pumpkin so 54/2 = <<54/2=27>>27 pounds
Betty's pumpkin weighs 4 times the amount of Jessica's 27-pound pumpkin so it weighs 4*27 = <<4*27=108>>108
Betty has the heaviest pumpkin at 108 pounds while Jessica's is the lowest at 27 pounds so the difference is 108-27 =<<108-27=81>>81 pounds
#### 81