These problems relate to objects of different weight, and using a balanced scale to determine the odd item, be it a false coin, or an under-filled sack of grain. (Usually it's coins though)
• Mr. Salazar weighs 250 pounds.
• Ms. Karstens weighs 100 pounds.
• Mr. Roth weighs 150 pounds. • The elevator they need to ride only holds 300 pounds.
• They must all get to the top floor of the building.
• There must be an operator in the elevator at all times.
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