Question
Ian has a mass of 78 kg. David is 9 kg lighter than Ian.
  1. What is David's mass?
  2. Express David's mass as a fraction of Ian's mass. Give your answer in its lowest terms.
4 m
(a)

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(b)

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Ian has a mass of 78 kg. David is 9 kg lighter than Ian.
  1. What is David's mass?
  2. Express David's mass as a fraction of Ian's mass. Give your answer in its lowest terms.