8 people took 10 hrs to built a Wall so how many hrs will 4. People take
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if 8 people take 10 hrs then 4 people will take 20 hrs.
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If a wall is built by 8 people in 10 hours and then the no. of people is reduced to half of 8, that is 4 then the time taken by 4 people will be the double of 10 hours, that is 10*2= 20 hours.
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