Question
Packet B is one-fifth as heavy as Packet C. Packet D is 4 times as heavy as Packets B and C together. What is the mass of Packet D if Packet C is z kg?
2 m

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Packet B is one-fifth as heavy as Packet C. Packet D is 4 times as heavy as Packets B and C together. What is the mass of Packet D if Packet C is z kg?