Question
The total mass of Cathy, Usha and Linda is 21w kg. Cathy has a mass of 4w kg. Usha is 7 kg heavier than Cathy.
  1. What is Linda's mass in terms of w?
  2. If w = 12, what is Linda's mass? 
3 m
(a)

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(b)

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The total mass of Cathy, Usha and Linda is 21w kg. Cathy has a mass of 4w kg. Usha is 7 kg heavier than Cathy.
  1. What is Linda's mass in terms of w?
  2. If w = 12, what is Linda's mass?