Question
David has a mass of 6r kg. Harry is 3 kg heavier than David. The mass of Sabrina is four times the total mass of David and Harry.
  1. Find the total mass of the 3 children in terms of r.
  2. If r = 2, find the average mass of the 3 children.
2 m
(a)

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(b)

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David has a mass of 6r kg. Harry is 3 kg heavier than David. The mass of Sabrina is four times the total mass of David and Harry.
  1. Find the total mass of the 3 children in terms of r.
  2. If r = 2, find the average mass of the 3 children.