Question
Farmer Nick has 4 ducks. The mass of Duck T is the same as the average mass of the 4 ducks. Duck U weighs 1 kg less than the average mass of the 4 ducks. The mass of Duck V is 7 kg more than the average mass of the 4 ducks. The mass of Duck W is 15 kg. Find the total mass of the 4 ducks.
3 m

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Farmer Nick has 4 ducks. The mass of Duck T is the same as the average mass of the 4 ducks. Duck U weighs 1 kg less than the average mass of the 4 ducks. The mass of Duck V is 7 kg more than the average mass of the 4 ducks. The mass of Duck W is 15 kg. Find the total mass of the 4 ducks.