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Dominic, Ralf and Peter have just eaten a HUGE Christmas meal. Dominic now weighs half as much as Ralf, and Peter weighs three times as much as Dominic. Together they weigh 720 pounds. How much does Dominic weigh?

Answer :

W0lf93
We know that: d = r / 2, so: r = 2 d. Also: r = 2 d and d + r + p = 720 pounds, where: d stays for Dominic, r stays for Ralf and p for Peter. When we charge: r = 2 d and p = 3 d in the 3rd equation we have: d + 2 d + 3 d = 720. 6 d = 720; d = 720 : 6; d = 120. Answer: Dominic weighs 120 pounds. Hope this helps. Let me know if you need additional help!

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