In all fairness the challenge should be calculated as a "percentage" of weight lost. (weightloss / total start weight)
The smaller portly anglers to lose 20lbs involves more diet and exercise then a larger portly. The larger portly probably can loss 10lbs in just one dump and another 10 lb. in retained water.
20lb/200lb = 10.00%
20lb/300/b = 6.66%
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