Question
The total mass of Diana, Kathy and Penelope is 31z kg. Diana has a mass of 5z kg. Kathy is 4 kg heavier than Diana.
  1. What is Penelope's mass in terms of z?
  2. If z = 9, what is Penelope's mass? 
3 m
(a)

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(b)

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The total mass of Diana, Kathy and Penelope is 31z kg. Diana has a mass of 5z kg. Kathy is 4 kg heavier than Diana.
  1. What is Penelope's mass in terms of z?
  2. If z = 9, what is Penelope's mass?