Question
David has a mass of 5n kg. Lee is 3 kg heavier than David. The mass of Risa is twice the total mass of David and Lee.
  1. Find the total mass of the 3 children in terms of n.
  2. If n = 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 5n kg. Lee is 3 kg heavier than David. The mass of Risa is twice the total mass of David and Lee.
  1. Find the total mass of the 3 children in terms of n.
  2. If n = 2, find the average mass of the 3 children.