Question
The total mass of Sarah, Opal and Roshel is 30b kg. Sarah has a mass of 6b kg. Opal is 3 kg heavier than Sarah.
  1. What is Roshel's mass in terms of b?
  2. If b = 15, what is Roshel's mass? 
3 m
(a)

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(b)

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The total mass of Sarah, Opal and Roshel is 30b kg. Sarah has a mass of 6b kg. Opal is 3 kg heavier than Sarah.
  1. What is Roshel's mass in terms of b?
  2. If b = 15, what is Roshel's mass?