John weighs twice as much as Maria. Maria's weight is 60% of Bob's weight. Dave's weight is 50% of Lee's. Lee weighs 190% as much as John does. Which of these 5 persons weighs the least?
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To avoid decimals, you can assign a convenient number to the base variable. If Maria = 60 kg, then Bob = 100 kg, John = 120 kg, Lee = 228 kg, and Dave = 114 kg. It's immediately clear Maria is the lightest.