Question
Farmer Wesley has 4 dogs. The mass of Dog P is the same as the average mass of the 4 dogs. Dog Q weighs 3 kg less than the average mass of the 4 dogs. The mass of Dog R is 8 kg more than the average mass of the 4 dogs. The mass of Dog S is 9 kg. Find the total mass of the 4 dogs.
3 m

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Farmer Wesley has 4 dogs. The mass of Dog P is the same as the average mass of the 4 dogs. Dog Q weighs 3 kg less than the average mass of the 4 dogs. The mass of Dog R is 8 kg more than the average mass of the 4 dogs. The mass of Dog S is 9 kg. Find the total mass of the 4 dogs.