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Olympiad-Math
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Class 6
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Percentages
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Q)
A work can be done by Arun and Balu is 15 days; by Balu and Chandan in 20 days and by Chandan and Arun in 30 days. In how many days can Chandan alone do the work ?
( A ) 150
( B ) 90
( C ) 100
( D ) 120
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