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Four workers are building a house. In five days they built half the house. But winter is coming and they want to finish building the house in two more days. How many friends should the workers call for help, if they do not want to bother more people than is necessary?

 Feb 16, 2020
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A decrease of 2/5 =40% in time, will require an increase of 1/40% =2.5 in manpower to finish the job in 2 days. So, 2.5 x 4 = 10 workers will be needed.Or 10 - 4 = 6 additional workers to finish the job in 2 days.

 Feb 16, 2020

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