if 10 men complete a work in 50 days then how many men complete this work in 20 days

If 10 men complete a work in 50 days,then how many men complete this work in 20 days
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2 Answers

1 man take 500 daes, so werk rate=1/500

thus, tu get dun in 20 daes, need werk rate=1/20

so, x*(1/500)=1/20

x=500/20=25 men
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4 men.    10 men to 50 days is 1:5 ratio.   So 4 men to 20 days is also a 1:5 ratio
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