Question
PSLE
The average mass of 3 boys, David, Bryan, Christian, is 36 kg. David is heavier than Bryan by 4 kg. The total mass of David and Bryan is the same as the mass of Christian. What is the mass of Christian?
2 m

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PSLE
The average mass of 3 boys, David, Bryan, Christian, is 36 kg. David is heavier than Bryan by 4 kg. The total mass of David and Bryan is the same as the mass of Christian. What is the mass of Christian?