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3 men or 7 women can do a piece of work in 32 days. The number of days required by 7 men and 5 women to do a piece of work twice as large is

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3 men or 7 women can do a piece of work in 32 days. The number of days required by 7 men and 5 women to do a piece of work twice as large is
  • A19
  • B21
  • C27
  • D36
Answer not set

Discussion 1

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CCommunity
I think 21 is right