Question
Archie has a mass of 90 kg. Ethan is 18 kg lighter than Archie.
  1. What is Ethan's mass?
  2. Express Ethan's mass as a fraction of Archie's mass. Give your answer in its lowest terms.
4 m
(a)

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(b)

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Archie has a mass of 90 kg. Ethan is 18 kg lighter than Archie.
  1. What is Ethan's mass?
  2. Express Ethan's mass as a fraction of Archie's mass. Give your answer in its lowest terms.