Question
Farmer Billy has 4 dogs. The mass of Dog B is the same as the average mass of the 4 dogs. Dog C weighs 5 kg less than the average mass of the 4 dogs. The mass of Dog D is 10 kg more than the average mass of the 4 dogs. The mass of Dog E is 12 kg. Find the total mass of the 4 dogs.
3 m

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Farmer Billy has 4 dogs. The mass of Dog B is the same as the average mass of the 4 dogs. Dog C weighs 5 kg less than the average mass of the 4 dogs. The mass of Dog D is 10 kg more than the average mass of the 4 dogs. The mass of Dog E is 12 kg. Find the total mass of the 4 dogs.