Question
Farmer Ian has 4 hens. The mass of Hen F is the same as the average mass of the 4 hens. Hen G weighs 3 kg less than the average mass of the 4 hens. The mass of Hen H is 10 kg more than the average mass of the 4 hens. The mass of Hen J is 15 kg. Find the total mass of the 4 hens.
3 m

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Farmer Ian has 4 hens. The mass of Hen F is the same as the average mass of the 4 hens. Hen G weighs 3 kg less than the average mass of the 4 hens. The mass of Hen H is 10 kg more than the average mass of the 4 hens. The mass of Hen J is 15 kg. Find the total mass of the 4 hens.