Question
Farmer Oscar has 4 cats. The mass of Cat B is the same as the average mass of the 4 cats. Cat C weighs 2 kg less than the average mass of the 4 cats. The mass of Cat D is 4 kg more than the average mass of the 4 cats. The mass of Cat E is 11 kg. Find the total mass of the 4 cats.
3 m

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Farmer Oscar has 4 cats. The mass of Cat B is the same as the average mass of the 4 cats. Cat C weighs 2 kg less than the average mass of the 4 cats. The mass of Cat D is 4 kg more than the average mass of the 4 cats. The mass of Cat E is 11 kg. Find the total mass of the 4 cats.