The question requires us to form an algebraic expression in order to
calculate Dominic's weight, after telling us his weigh with respect to
his peers and the sum of their weights. Let D represent Dominic's
weight, R represent Ralph's weight and P represent Peter's weight. From
the given information, we can form: 2D = R 3D = P P + R + D = 720 Now, we substitute values into the last equation: 3D + 2D + D = 720 6D = 720 D = 120 Dominic's weight is 120 pounds
