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