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Working alone, Farida finishes a quilt in 20 days while Gita needs 30 days. They work together for 6 days, and then Gita leaves. How many more days does Farida need to finish the quilt?

Competition practiceTime & Work / Pipes
  • A10
  • B12
  • C15
  • D8

Step-by-Step Solution

Together they do 1/20 + 1/30 = 1/12 per day, so in 6 days they finish 1/2. Farida does the other 1/2 at 1/20 per day: days.
Answer: A) 10

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