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40 men can complete a work in 40 days. T...

40 men can complete a work in 40 days. They started the work together. But at the end of each 10th day, 5 men left the job. The work would have been completed in

A

A. `56(2)/(3)` days

B

B. `53(1)/(3)` days

C

C. 52 days

D

D. 50 days

Text Solution

Verified by Experts

The correct Answer is:
A

माना 1 व्यक्ति द्वारा 1 दिन किया गया कार्य = 1 इकाई
`:.` कुल कार्य `= 40xx40= 1600` unit
40 व्यक्तियों द्वारा 10 दिन में किया गया कार्य = 400 unit.
A/Q
35 men 10 दिनों में = 350 unit.
30 men 10 दिनों में = 300 unit
25 men 10 दिनों में = 250 unit
20 men 10 दिनों में = 200 unit
बाकी व्यक्ति = 20-5 =15
तथा बाकी काम = 1600-1500 = 100 unit
बाकी काम को खत्म करने में लगा समय `(100)/(15) = 6(2)/(3) "day"` लगा समय `(100)/(15) = 6(2)/(3) day`
कुल दिन `= 50 + 6(2)/(3) = 56(2)/(3)` day
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