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Q:

A goldsmith observes that one of his employees prepares a necklace in 9 hours, while another employee prepares it in 10 hours. If they work together, they stud 10 gems less every hour and thus prepare a necklace in 5 hours, then the number of gems studded in each necklace is: 

  • 1
    1200
  • 2
    1000
  • 3
    800
  • 4
    900
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Answer : 4. "900 "

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