Question
The total mass of Jane, Marion and Lucy is 21d kg. Jane has a mass of 9d kg. Marion is 3 kg heavier than Jane.
  1. What is Lucy's mass in terms of d?
  2. If d = 15, what is Lucy's mass? 
3 m
(a)

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(b)

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The total mass of Jane, Marion and Lucy is 21d kg. Jane has a mass of 9d kg. Marion is 3 kg heavier than Jane.
  1. What is Lucy's mass in terms of d?
  2. If d = 15, what is Lucy's mass?