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Q:

In a moter of 120 machine parts, 5 % parts were defective, in another motor of 80 machine parts, 10 % parts were defective. For the two motors considered together, the percentage of defective machine parts were 

  • 1
    6.5
  • 2
    7.5
  • 3
    7
  • 4
    8
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Answer : 3. "7"

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