Question
The total mass of David and Sean is 166 kg. The total mass of Tim and Sean is 131 kg.
  1. How much heavier is David than Tim?
  2. If the total mass of the 3 boys is 231 kg, how heavy is Sean?
4 m
(a)

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(b)

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The total mass of David and Sean is 166 kg. The total mass of Tim and Sean is 131 kg.
  1. How much heavier is David than Tim?
  2. If the total mass of the 3 boys is 231 kg, how heavy is Sean?