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Afia can do her term paper in 15 days which takes Babul 20 days to finish . What is the fraction of work left if both afia & Babul work together for 4 days?

Correct Answer: 8/15
In 15 days Afia does 1 portion In 4 days Afia does 4/15 portion Again, In 20 day's Babul does 1 portion In 4 days Babul does 4 /20 portion Afia and Babul work together in 4 days = 4/15 + 4/20 = 7/15 portion left = 1 - 7/15 = 8/15 portion.

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