20 men can construct a building 40 days. how long will it take 10 men to do this work ?

                                 

Question : 20 men can construct a building 40 days. how long will it take 10 men to do this work ? OR Twenty Men Can Construct a Building forty days. How Long Will It Take Ten Men to Do This Work ?

Solution : Men Days

20 40

10 ?

10 : 20 = 40 : x

10x=20*40

10x=800

x=800/10

x = 80 ans

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