Question

Beniamin, who weighs one hundred five pounds, sat eight feet from the center of a seesaw. Dylan sat three feet on the other side of the center to balance the seesaw. How much does Dylan weigh?
To balance the seesaw, the two weights and their distances from the center must be equal:

105 pounds x 8 feet = Dylan's weight x 3 feet

840 = 3D

Dylan weighs 280 pounds.

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