Question
Farmer Harry has 4 puppies. The mass of Puppy P is the same as the average mass of the 4 puppies. Puppy Q weighs 3 kg less than the average mass of the 4 puppies. The mass of Puppy R is 5 kg more than the average mass of the 4 puppies. The mass of Puppy S is 9 kg. Find the total mass of the 4 puppies.
3 m

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Farmer Harry has 4 puppies. The mass of Puppy P is the same as the average mass of the 4 puppies. Puppy Q weighs 3 kg less than the average mass of the 4 puppies. The mass of Puppy R is 5 kg more than the average mass of the 4 puppies. The mass of Puppy S is 9 kg. Find the total mass of the 4 puppies.