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Q: A can do a piece of work in 15 days and B in 20 days. If they together work it for 4 days, then the fraction of the work that is left is:

  • 1
    $${8\over 15}$$
  • 2
    $${7\over 15}$$
  • 3
    $${1\over 4}$$
  • 4
    $${1\over 10}$$
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Answer : 1. "$${8\over 15}$$"

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