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20 आदमी किसी काम को 18 दिनों में कर सकते है वे 3 दिनों साथ काम करते है फिर 5 आदमी और आ जाते है तो काम और कितने दिनों में समाप्त हो जायेगा ?A. 12 daysB. 14 daysC. 13 daysD. 15 days |
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Answer» Correct Answer - a (a) 20 men `to` 18 days `implies` work done by them in 3. days working Together `=1xx3=3` work `implies` remaining work `=18-3=15` work `implies` 15 work is to be done by `(20+5)=25` men `therefore ` Efficiency of 20 men =1 Efficiency of 1 man `=(5)/(20)=(1)/(4)` `implies` so , efficiency of `(20+5)` `implies` 25 men `=(1)/(4)=(5)/(4)` working days Required time `=("Work")/(efficency )~~ (15)/(5//4)=12` days therefore 12 more days will be taken tp finish the remaining be taken to finish the reamaing work अंत : कार्य समाप्त करने में 12 दिन और लगेंगे Alternate 20 men can do 18 days so total work `=18xx20=360` 20 men 3 days work `=20xx3=60` remaining work` = 360-60=300` After joining 5 men total men =20 +5 so `(300)/(25)=12 days` |
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