answered by **Guest**

The question requires us to form an algebraic expression in order tocalculate Dominics weight, after telling us his weigh with respect tohis peers and the sum of their weights. Let D represent Dominicsweight, R represent Ralphs weight and P represent Peters weight. Fromthe 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

Dominics weight is 120 pounds

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