Question
Farmer Fred has 4 ducks. The mass of Duck G is the same as the average mass of the 4 ducks. Duck H weighs 9 kg less than the average mass of the 4 ducks. The mass of Duck J is 10 kg more than the average mass of the 4 ducks. The mass of Duck K is 13 kg. Find the total mass of the 4 ducks.
3 m

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Farmer Fred has 4 ducks. The mass of Duck G is the same as the average mass of the 4 ducks. Duck H weighs 9 kg less than the average mass of the 4 ducks. The mass of Duck J is 10 kg more than the average mass of the 4 ducks. The mass of Duck K is 13 kg. Find the total mass of the 4 ducks.