Question
Farmer Ken has 4 cats. The mass of Cat P is the same as the average mass of the 4 cats. Cat Q weighs 6 kg less than the average mass of the 4 cats. The mass of Cat R is 7 kg more than the average mass of the 4 cats. The mass of Cat S is 13 kg. Find the total mass of the 4 cats.
3 m

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Farmer Ken has 4 cats. The mass of Cat P is the same as the average mass of the 4 cats. Cat Q weighs 6 kg less than the average mass of the 4 cats. The mass of Cat R is 7 kg more than the average mass of the 4 cats. The mass of Cat S is 13 kg. Find the total mass of the 4 cats.