Question
The total mass of Zara, Ivory and Barbara is 42b kg. Zara has a mass of 9b kg. Ivory is 9 kg heavier than Zara.
  1. What is Barbara's mass in terms of b?
  2. If b = 15, what is Barbara's mass? 
3 m
(a)

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(b)

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The total mass of Zara, Ivory and Barbara is 42b kg. Zara has a mass of 9b kg. Ivory is 9 kg heavier than Zara.
  1. What is Barbara's mass in terms of b?
  2. If b = 15, what is Barbara's mass?