Question
Farmer Julian has 4 cats. The mass of Cat N is the same as the average mass of the 4 cats. Cat P weighs 3 kg less than the average mass of the 4 cats. The mass of Cat Q is 5 kg more than the average mass of the 4 cats. The mass of Cat R is 5 kg. Find the total mass of the 4 cats.
3 m

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Farmer Julian has 4 cats. The mass of Cat N is the same as the average mass of the 4 cats. Cat P weighs 3 kg less than the average mass of the 4 cats. The mass of Cat Q is 5 kg more than the average mass of the 4 cats. The mass of Cat R is 5 kg. Find the total mass of the 4 cats.