Question
The total mass of Opal, Mary and Gem is 45x kg. Opal has a mass of 7x kg. Mary is 4 kg heavier than Opal.
  1. What is Gem's mass in terms of x?
  2. If x = 11, what is Gem's mass? 
3 m
(a)

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(b)

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The total mass of Opal, Mary and Gem is 45x kg. Opal has a mass of 7x kg. Mary is 4 kg heavier than Opal.
  1. What is Gem's mass in terms of x?
  2. If x = 11, what is Gem's mass?