Question
Farmer Glen has 4 geese. The mass of Goose N is the same as the average mass of the 4 geese. Goose P weighs 1 kg less than the average mass of the 4 geese. The mass of Goose Q is 5 kg more than the average mass of the 4 geese. The mass of Goose R is 13 kg. Find the total mass of the 4 geese.
3 m

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Farmer Glen has 4 geese. The mass of Goose N is the same as the average mass of the 4 geese. Goose P weighs 1 kg less than the average mass of the 4 geese. The mass of Goose Q is 5 kg more than the average mass of the 4 geese. The mass of Goose R is 13 kg. Find the total mass of the 4 geese.