human
If Mark weighs 150 pounds and Susan weighs 20 pounds less than Mark. And their friend Bob weighs twice as much as Susan. What is the average weight of the 3 friends?
assistant
How much does Susan weigh? ** Susan weighs 150 pounds - 20 pounds = <<150-20=130>>130 pounds.
How much does Bob weigh? ** Bob weighs 2 * 130 pounds = <<2*130=260>>260 pounds.
What is the total weight of the 3 friends? ** The friends total weight is 150 + 130 + 260 pounds = <<150+130+260=540>>540 pounds.
What is the average weight of the 3 friends? ** The friends' average weight is 540 pounds / 3 = <<540/3=180>>180 pounds.
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