Question
Farmer Ian has 4 ducks. The mass of Duck J is the same as the average mass of the 4 ducks. Duck K weighs 4 kg less than the average mass of the 4 ducks. The mass of Duck L is 7 kg more than the average mass of the 4 ducks. The mass of Duck M is 9 kg. Find the total mass of the 4 ducks.
3 m

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Farmer Ian has 4 ducks. The mass of Duck J is the same as the average mass of the 4 ducks. Duck K weighs 4 kg less than the average mass of the 4 ducks. The mass of Duck L is 7 kg more than the average mass of the 4 ducks. The mass of Duck M is 9 kg. Find the total mass of the 4 ducks.