Question
Farmer Japheth has 4 hens. The mass of Hen P is the same as the average mass of the 4 hens. Hen Q weighs 2 kg less than the average mass of the 4 hens. The mass of Hen R is 4 kg more than the average mass of the 4 hens. The mass of Hen S is 12 kg. Find the total mass of the 4 hens.
3 m

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Farmer Japheth has 4 hens. The mass of Hen P is the same as the average mass of the 4 hens. Hen Q weighs 2 kg less than the average mass of the 4 hens. The mass of Hen R is 4 kg more than the average mass of the 4 hens. The mass of Hen S is 12 kg. Find the total mass of the 4 hens.