Question
The total mass of Zoe, Mary and Gabby is 40f kg. Zoe has a mass of 6f kg. Mary is 6 kg heavier than Zoe.
  1. What is Gabby's mass in terms of f?
  2. If f = 15, what is Gabby's mass? 
3 m
(a)

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(b)

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The total mass of Zoe, Mary and Gabby is 40f kg. Zoe has a mass of 6f kg. Mary is 6 kg heavier than Zoe.
  1. What is Gabby's mass in terms of f?
  2. If f = 15, what is Gabby's mass?