Question
David is 5 kg heavier than Ethan and 4 kg heavier than Mark. The average mass of the 3 men is 77 kg. Find the average mass of Ethan and Mark.
2 m

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David is 5 kg heavier than Ethan and 4 kg heavier than Mark. The average mass of the 3 men is 77 kg. Find the average mass of Ethan and Mark.