Question
The total mass of Joelle, Gwen and Fiona is 27m kg. Joelle has a mass of 7m kg. Gwen is 4 kg heavier than Joelle.
  1. What is Fiona's mass in terms of m?
  2. If m = 15, what is Fiona's mass? 
3 m
(a)

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(b)

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The total mass of Joelle, Gwen and Fiona is 27m kg. Joelle has a mass of 7m kg. Gwen is 4 kg heavier than Joelle.
  1. What is Fiona's mass in terms of m?
  2. If m = 15, what is Fiona's mass?