Question
Farmer Henry has 4 cats. The mass of Cat C is the same as the average mass of the 4 cats. Cat D weighs 4 kg less than the average mass of the 4 cats. The mass of Cat E is 5 kg more than the average mass of the 4 cats. The mass of Cat F is 15 kg. Find the total mass of the 4 cats.
3 m

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Farmer Henry has 4 cats. The mass of Cat C is the same as the average mass of the 4 cats. Cat D weighs 4 kg less than the average mass of the 4 cats. The mass of Cat E is 5 kg more than the average mass of the 4 cats. The mass of Cat F is 15 kg. Find the total mass of the 4 cats.