Question
Farmer Flynn has 4 hens. The mass of Hen S is the same as the average mass of the 4 hens. Hen T weighs 1 kg less than the average mass of the 4 hens. The mass of Hen U is 4 kg more than the average mass of the 4 hens. The mass of Hen V is 15 kg. Find the total mass of the 4 hens.
3 m

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Farmer Flynn has 4 hens. The mass of Hen S is the same as the average mass of the 4 hens. Hen T weighs 1 kg less than the average mass of the 4 hens. The mass of Hen U is 4 kg more than the average mass of the 4 hens. The mass of Hen V is 15 kg. Find the total mass of the 4 hens.