Question
Farmer Paul has 4 cats. The mass of Cat R is the same as the average mass of the 4 cats. Cat S weighs 1 kg less than the average mass of the 4 cats. The mass of Cat T is 9 kg more than the average mass of the 4 cats. The mass of Cat U is 7 kg. Find the total mass of the 4 cats.
3 m

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Farmer Paul has 4 cats. The mass of Cat R is the same as the average mass of the 4 cats. Cat S weighs 1 kg less than the average mass of the 4 cats. The mass of Cat T is 9 kg more than the average mass of the 4 cats. The mass of Cat U is 7 kg. Find the total mass of the 4 cats.