Question
Mark has a mass of 7r kg. Neave is 4 kg heavier than Mark. The mass of Sarah is twice the total mass of Mark and Neave.
  1. Find the total mass of the 3 children in terms of r.
  2. If r = 3, find the average mass of the 3 children.
2 m
(a)

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(b)

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Mark has a mass of 7r kg. Neave is 4 kg heavier than Mark. The mass of Sarah is twice the total mass of Mark and Neave.
  1. Find the total mass of the 3 children in terms of r.
  2. If r = 3, find the average mass of the 3 children.