Question
Farmer Fred has 4 dogs. The mass of Dog D is the same as the average mass of the 4 dogs. Dog E weighs 1 kg less than the average mass of the 4 dogs. The mass of Dog F is 2 kg more than the average mass of the 4 dogs. The mass of Dog G is 13 kg. Find the total mass of the 4 dogs.
3 m

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Farmer Fred has 4 dogs. The mass of Dog D is the same as the average mass of the 4 dogs. Dog E weighs 1 kg less than the average mass of the 4 dogs. The mass of Dog F is 2 kg more than the average mass of the 4 dogs. The mass of Dog G is 13 kg. Find the total mass of the 4 dogs.