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X is 4 time as efficient as y and take 27 days less than y . find the time taken by x and y working alone.../

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Let y takes N days to do the work

x takes N/4 days to do the work
according to the condition
N/4=N-27
3/4N=27
N=27x4/3
N=36 days
Time taken by y= 36 days
Time taken by x=36/4=9 days
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