To drag a 500-pound boulder into place, Tyrone, Bill, and Chuck attach three ropes to the boulder

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To drag a 500-pound boulder into place, Tyrone, Bill, and Chuck attach three ropes to the boulder as shown in the diagram. If Tyrone pulls with 240 pounds of force and Chuck pulls with 110 pounds of force, then Bill must pull with how much force in order for the boulder to move?image

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