Question
PSLE
The average mass of 3 boys, David, Christian, Adam, is 34 kg. David is heavier than Christian by 9 kg. The total mass of David and Christian is the same as the mass of Adam. What is the mass of Adam?
2 m

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PSLE
The average mass of 3 boys, David, Christian, Adam, is 34 kg. David is heavier than Christian by 9 kg. The total mass of David and Christian is the same as the mass of Adam. What is the mass of Adam?