Question
The total mass of Billy and Eva is 6912 kg. Billy weighs 3129 kg. 
  1. What is Eva's mass?
  2. How much heavier than Billy is Eva?
4 m
(a)

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(b)

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The total mass of Billy and Eva is 6912 kg. Billy weighs 3129 kg. 
  1. What is Eva's mass?
  2. How much heavier than Billy is Eva?