Question
A can complete a job in 15 days; B in 20 days. They work together for 5 days. What fraction remains?
Solution
ATQ,
In 1 day they do (1/15 + 1/20 = 7/60).
In 5 days = 35/60 = 7/12. Remaining = 1 β 7/12 = 5/12
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